Are these body proportions realistic on a guy?

The neck is too wide besides that it's fine. :)

It's pretty good, to be honest. I suggest that Ты make a grid as a guideline(3 by 3, squares). Ты draw the head in the middle and the shoulders should fill up the squares on the left and right. What Ты did is quite all right, but I think the shoulders should be a bit еще broad. Other than that I think it's OK.
Tips on how to make the torso look better and еще defined: link