Wow... Okay, definately work on shading, you charizard's outline is extremely shoppy, it looks resized. You colors don't match to well and it looks like you used default paint colors. Look at a Fr/Lg sprite while doing revamps to help you get it right. Your Venasaur's colors are too light. Also, on some of the recolors you can see the original outlines. And your scratch is horrid, it's blocky, bad shading, thick outline. And for the outlines, don't just use all black.
1.5/10