Hope you don't mind me redlining… D:

1: Try giving a bit of space between the hairline and the eyebrows. This'll give him a bit more forehead
smile 2: His ear looks a little weird for me so this is purely just my opinion.
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2A: The highest peak of the earlobe should be in line with the eyebrows.
2B: Where the ear begins should be in line with the corner of his eye.
2C: Bottom of the ear should end in line or below the bottom of the nose.
3: I think people have mentioned about the chest already but just lowering it and placing the nipples a little away from where the chest is accentuated should help with it.
4: The chest muscle is tightened and stretched when the arm is lifted high so it creates somewhat of a squeezed chest on the side.
5: He seems to have a lot of muscles on his arms so there should be a bulge as he's contracting the muscles
smile 6: There should be a bulge there as the fat/muscles are being squished.
7: Try to sketch out his rib cage and from there, it'll help you with the where to place the abs or other muscles as well as help show you where you can accentuate his body.
biggrin Below are a few references of male torsos and how the muscles work. It should help you :3 A lot of artists gather references to help them with their art so don't be afraid of using bits and pieces of other people's work for
reference. I've chosen the two that have their arm/s behind their heads and their chest and stomach showing.
http://bit.ly/fHjGjshttp://bit.ly/ffD3X4