Made an poor quick edit.
He doesn't seem to have any bones, tried mending that. His beer belly's shading looks like it's going in.
The cape seemed randomly shaded, I just made it a flat red.
The paper bag's highlight was weird. light doesn't stay to the edge of an object, tried giving it a bit of dimension too.
For the background I figured a solid color would detract less, it's weird for silhouettes to have outlines. The solid color fixes your bad jaggy lines too.
I think you should play with some minor hue shifting and overall palette rearranging.
