hi! thanks for the comment!
My logic was to give more shading to the hat to rendering better his cylinder shape. For the clothes i prefered
to not overload the image with more colors using more shading. But yea, i think you are right because that give coerence to the image. Thank you!!
You have got some nice lighting on the hat but no lighting on the clothes. I think adding some shading to the clothes at least would help it a bit. Having shading only on the hat makes it the peice's "logic" a bit confusing, if that makes sense. When I look at the picture, my focus is on the hat then I question why there is only light falling on the hat and no-where else. Basicly the tl;dr of my comment is I think you should either shade everything or don't have any shading to keep the picture consistent with itself.
It's very simple and I love this ;)