Now, lets have some fun!
The head and hand are nice but the torso is horrible. The breast is too squerish and flat, even for a muscular man. You are probebly influenced by manga/anime, which isn't good! Most of these drawers don't know to draw and don't know a thing about proportions.
The breast is flat at the top and as it get nearer to the bottom is gets bigger. It should still be quite squrish so don't round it too much, or else it will look like a woman's breast.
The top of the ribs has a small bump near the middle, feel them on your own body and understand what I mean.
The shoulders are way too low. I mean that the elevation in the upper back ribs(right below the neck) shouldn't be that high reletivly to the shoulders. If you will raise the shoulders a bit then it'll look fine.
The tendon on the neck is a bit too highlighted. The side that heads outward gently slopes while the one that head into the space between the two is bumpy.
And last but not least- What on earth did you do to his lower breast? It looks so unnatural. Half of his body is a body of a starved man and half isn't. You shouldn't make the ribs noticible like that, only make a line that marks the end of the ribs, if you like. In the middle it's not always noticible, it just slopes gently and at the sides it's a bit more bumpy.
anatomicaly correct model
Sheesh, you need to learn alot more on anatomy before you can say that. This model is way far from perfect!