Not bad, not bad at all.
I'd suggest continuing to work on details like the shoulder placement (how far they're protruding out from the upper ribs and torso is a bit extreme for the proportions suggested by the head/neck and pecs), and perhaps being more subtle and less literal with the lines being used to define the contours of the pecs and abs (you've got good shading in there, there's less need for including the complete contour lines in the finished product). Some preliminary study of depth tricks and creative posing to give more a sense of full 3d rather than settling for a flat, face-on composition seems like a worthy next step for your progression.
Keep it up.
I've been studying anatomy lately so I can get all the curves and muscles cleaned up, and this is what I've got so far. I plan to add a background to this image and turn it into a comic book cover style piece. I think I've really made some progress.
My faces are definitely getting better as well a my shading I think.
As always, I don't mind constructive criticism or tips.
Jonny Icon: Legacy