Hello.
Do you mind if I ask why the manequin has a green rat head? I think It'd make more sense if he were either just a manequin or just a rat...but oh well, it's your game.
The main things I see are your messy lines, inconsistent lightsources, and odd leg movement. The sleeves vary in length from frame to frame, and the walk looks really unbalanced, Like the guy is constantly in a half-crouch. The body rotation is good, but with the shading, it looks like he's walking under a flickering light.
As you said, you need to work on color choosery.
Honestly, this isn't bad for a beginner.