It could be helpful to remove everything, but the the stuff he did himself could be used, or replacing it with some basic sketch to retain the overall shape. Then it would rather be concept art.
I would really like to adapt some of your ideas, though.
There is a bit a lack of sci-fi pixelart, it feels like most is fantasy.
"No license" means you get an implicit license for using it in the scope where it was posted, which mostly means to download and use it personally. You have to get written permission for everything else.
That's why we use Creative Commons licenses, there is an easy to understand short version. With CC-BY you can use, modify and sell it as much as you want, without legal risks or asking for permission.
Those screenshots sound like an implicit license to use it in a game, but not to modify and distribute it. I'm not a lawyer, I dunno for sure. I use stuff licensed under Creative Commons licenses to avoid this legal crap. For uploading it here, you would need to ask those people if they can upload it here or on deviantart under a free license (CC0, CC-BY) or give you explicit permission to upload your modifications.
CC0 is closer to no license than an implicit license. It's not like we are doing all this because we want to sue, annoy, troll or demotivate people.
This is more related to just the paintings:
You can ignore all this, it most likely will be tolerated and go well. But it does not have to. With a commercial game that can mean, you invested much time, lose some(?) of your earnings and pay a fine or something like that.
LPC has other dimensions than his characters, but the head implant and those weird eyes could be adapted to LPC heads.
It could be helpful to remove everything, but the the stuff he did himself could be used, or replacing it with some basic sketch to retain the overall shape. Then it would rather be concept art.
Customer: "I purchased this software because it said we could use its results for our 2D games. Unfortunately, and to my knowledge it is still unclear to non-users willing to purchase, the software as of now only authorizes usage of its contents for "RPG Maker""
Developer: "We are doing everything we can alleviate this restriction which comes sadly from the RPG Maker license itself."
That would not look as good as what you linked, but that would be only 15 frames for each sex.
I guess there can be done much with layering a mutilated human body over the skeleton. Skeleton is missing a thrust animation, though.
Modular arms and legs could also be interesting for cyborgs. One could even go as far as doing modular arms and feet, which could be used for pirates and such.
Add all head variations for male and female human (for later animations)
The coloring of wolf(wo)man looks odd and is not considered finished.
Wolf heads, skeleton head and male ogre head don't have any shadow yet.
Head shadow of pgnant women is inconsistent between walk and slash animation.
This is the first pregnant slash animation. Second frame of left/right and third frame of bottom stick out and must be improved in the future. There are no compatible clothings for this yet.
I would really like to adapt some of your ideas, though.
There is a bit a lack of sci-fi pixelart, it feels like most is fantasy.
https://opengameart.org/content/lpc-skorpios-scifi-sprite-pack + https://opengameart.org/content/sci-fi-blue-pillar
"No license" means you get an implicit license for using it in the scope where it was posted, which mostly means to download and use it personally. You have to get written permission for everything else.
That's why we use Creative Commons licenses, there is an easy to understand short version. With CC-BY you can use, modify and sell it as much as you want, without legal risks or asking for permission.
Those screenshots sound like an implicit license to use it in a game, but not to modify and distribute it. I'm not a lawyer, I dunno for sure. I use stuff licensed under Creative Commons licenses to avoid this legal crap. For uploading it here, you would need to ask those people if they can upload it here or on deviantart under a free license (CC0, CC-BY) or give you explicit permission to upload your modifications.
CC0 is closer to no license than an implicit license. It's not like we are doing all this because we want to sue, annoy, troll or demotivate people.
This is more related to just the paintings:
You can ignore all this, it most likely will be tolerated and go well. But it does not have to. With a commercial game that can mean, you invested much time, lose some(?) of your earnings and pay a fine or something like that.
Edit: Better use those paintings:
Yes, I know.
It's too much work for just sharing something.
LPC has other dimensions than his characters, but the head implant and those weird eyes could be adapted to LPC heads.
It could be helpful to remove everything, but the the stuff he did himself could be used, or replacing it with some basic sketch to retain the overall shape. Then it would rather be concept art.
I really think the cyborg guy could be done with LPC http://gaurav.munjal.us/Universal-LPC-Spritesheet-Character-Generator/#?...
Edit: It also appears that the assets, which come with Game Character Hub, are only allowed to be used with RPG Maker.
"RPG Maker assets are for RPG Maker use only."
https://store.steampowered.com/app/292230/Game_Character_Hub/
Customer: "I purchased this software because it said we could use its results for our 2D games. Unfortunately, and to my knowledge it is still unclear to non-users willing to purchase, the software as of now only authorizes usage of its contents for "RPG Maker""
Developer: "We are doing everything we can alleviate this restriction which comes sadly from the RPG Maker license itself."
https://steamcommunity.com/id/Aekar/recommended/292230/
There is also the option to rebase on assets posted on open game art.
Like LPC for characters: (all cc-by-sa 3.0 and GPL 3.0)
Portraits:
There aren't many sci-fi tilesets:
Or removing everything you did not create yourself and somebody else merges it in the future.
Where are the diamonds from? Did you just add diamonds everywhere? I like that part, an easy but effective change.
There are some diamonds and similar stuff on oga:
Reduced from 65 to 7 colors.
I did this completely automatized with PNN Qantize option of mtPaint.
This is also less than half the size (15 KiB) of the original without any loss.
With indexd 8-bit PNG it would further drop to 9 KiB, but the semi-transparent shadow would be lost.
Maybe tag with arduboy and 1bit.
With just 10 colors, good job.
Maybe it would be better to put the plants into an overlay image, too.
I don't think I can do it, especially the Santa's Claws mask. Those "ears" already look weird in the original.
I have zombie heads on the back of my mind.
Similar to the third one of this https://opengameart.org/content/zombies
That would not look as good as what you linked, but that would be only 15 frames for each sex.
I guess there can be done much with layering a mutilated human body over the skeleton. Skeleton is missing a thrust animation, though.
Modular arms and legs could also be interesting for cyborgs. One could even go as far as doing modular arms and feet, which could be used for pirates and such.
The coloring of wolf(wo)man looks odd and is not considered finished.
Wolf heads, skeleton head and male ogre head don't have any shadow yet.
Head shadow of pgnant women is inconsistent between walk and slash animation.
This is the first pregnant slash animation. Second frame of left/right and third frame of bottom stick out and must be improved in the future. There are no compatible clothings for this yet.
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