hey, i know whats it like to work on something for a so long and it becomes hard to tell exactly whats off about. Here are just a few things I notice on first glance…
The arms need to be straightened out, and I dont mean extended, his arm is bending unnaturraly at the elbow almost as if his elbows are broken and his forearm just sags to the ground, also his pelvis needs to be wider, If your going for a smaller sneakeier kinda look with a smaller pelvis then his back / shoulders are way too broad. His knees in the front view are not centered in the front of his leg like they should be. The mass you have for the muscles in the legs should be centered for the most part behind the bone. It may help to see it better if you brought the feet together so he was standing in a more natural pose using the transpose tools. Not a bad start just gotta bring it in to a more natural look, look at male models for reference if all you have is drawings in your anatomy book, working from life always helps me.