The Black smoke/Blur around the edge looks kind of pointless, distracting and unfocusing. About one third of your painting is just black space that is not occupied by anything and is not even the part of the drawing. Try avoiding that for better composition's sake.
As another adivice - look into shapes more.
You indicaed a lot of individual shadows from creases and folds, and they sort of look acceptable to the eye, but then the overall form of the guy's body is percieved as flat and two dimentional sheet.
Try to experiment with more tonal contrast or look into cel shading tutorials to improve on that front.
You could find yourself quickly improving in the near future depending on how much time you devote to simply drawing.
Cheers m8.