Hello, Vladart! Your attribution notice and license are conflicting. If you want users of the graphics to leave you credits, you shoold choose OGA BY or CC BY license. If you want to use CC0 license, you can’t require users to leave you credits.

Very cool.  Do you have any space backgrounds.  I would love to feature them in some space games im developing.

 Any with more stars and less clouds.  How did you make these?  

Um, I'm pretty sure authors can ask nicely to be given credit anyway, in the way of common courtesy? People tend to do that with public domain works even though there's no requirement. I don't see a contradiction here, or a problem.

Good work, vladart.

It's not necessarily conflicting. He could be requesting, but not requiring, that you give credit. In that case, however, it should be clarified.

Hi, Thanks for this post! I'm using the 408-0 in my update for Save The Stars (Android).
Also, you didn't include the download files for the three images in the preview?