Here's the collection of 8 dragon graphics created for the Gameboy-style retro RPG "Dragon Battle" built in GBStudio and available now on Steam and itch.io.

Steam:

https://store.steampowered.com/app/1887570/Dragon_Battle/

itch:

https://apt18.itch.io/dragon-battle/

itch page includes free-to-play online version. (The only feature missing is an auto-save after each successful dragon combat.)

The original images are taken from on the gorgeous set "11 Dragons", "Undead Fossils" and "Pubic Domain Wesnoth Sprites". Dragons were lovingly re-redrawn and rendered in 4-color, 8-bit format for the game, and provided with attack animations. Additionally, the Feathered Serpent / Quetzacoatl was drawn by me (numonkeys) for the game, and I'm adding here to this set.

I hope these are useful for your own game dev needs!