The colors are good, but the shading not, the costume look like some crinkled paper. For the hat you can use, the right part of the skin to make it more real, here it look likes it's stuck on his head, but if you make the border in 3D you can get better result. Finally, we don't see the glasses on his head, first I thought that it was is hair, you can try to make is eye a little bit blue and the side part of the glasses darker. That's all, sorry for my terrible english, hope you have understood my point, Bye ! Good Job !