might want to try and make the thighs on the legs have less wrinkles since that part of th eleg is usually wider than the lowerleg and thus the pants would probably be tighter there.
the shape of the boots are not well defined(the 3 dimensional impression i get is that they are blobs or socks..).. pick the important features of the boots and make sure they get expressed in a way which is understandable to the viewer. its just hard to discern how the boots are structure currently.
his open hand looks alright, but th eclosed hand is kinda thin i feel, but he does have a skinny frame of a body, so i dunno.
the foreshortening on the outstretched forearm isnt working.. try making it darker(so as the arm points more towards the viewer, the less light should shine off it towards us).. you may want to extend the elbow out more to the left on the same arm.
also, the shirt is kinda short..