Super Mario Bros custom tileset

[Novally]

Jeez dude lol. Those sprites look like they're breaking their own legs each time they move. The fireballs aren't shaded. You should start with a stick figure for poses to learn shape instead of trying to aim for the final product in one full blast. Color choices are...rough and in your face. It's too bright without the another tone to even it out. Shading should be worked on.