My Custom Mario-themed Spritesheets

[Quetzalcoatl]

Thanks for the criticism, guys. I have just adjusted the contrast on the red, as well as I have done some cleaning up in the second-to-last frame (though I'm not sure whether some more tweaks on its mouth would be needed or not...).

Here's how the sprites turned out after my tweaks/edits:



Some feedback would be nice.