You should go over the proportions again. His face is looking wierd, both in the concept and in the model. And his waist is too thin concidering he's supposed to be a pretty big guy.
And another note, if you're going to present that model against a black background, atleast give us a backlight to light up his border because we're loosing some of the model now due to the model being shaded to black and therefor melting in with the background. You could present him on a neutral grey background though.
Ill agree on the proportions, you need to shrink the legs down a tad and for his mid section make it bigger. He has the hour glass feel to his body, so work on on the proportions in the mid section and his legs.
put more muscle tone in the legs from them looking like cylinders or you can even put ripples like it's the pants but if you do that then the pant's need to be bigger like they're baggy, and the waist is too small but that's just my opinion.
I would say that the entire upper body needs to be wider, it should be at least as wide as the vest he is wearing. Waist is too thin and the crotch looks a bit weird. I would say that his forehead probably needs more of a slope, it looks a bit "pointy" at the moment. As someone else suggested before anatomy references _really_ help. Adjust anatomy and proportions a bit and you should have a pretty nice start.
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his legs look like cylinders
And another note, if you're going to present that model against a black background, atleast give us a backlight to light up his border because we're loosing some of the model now due to the model being shaded to black and therefor melting in with the background. You could present him on a neutral grey background though.
But keep going!
Keep up the good work man
find some orthographic drawings and for a start, stick them in your viewport background and literally trace over them with your mesh.