Alright, first off, you have a freakishly solid grasp of tone and form, especially in bulging muscles. Seriously, it's really bloody impressive! That aside, you need to remember that all blokes don't lift cars over their heads and smack down protein shakes like they're going out of fashion - try doing an unclothed, lithe figure sometime soon, like that bikini gal you've got going there, but bring up some of that form skill and you'll be golden my friend!
Another little thing is faces. Now, I'm not sure if that particular look's what you're going for here, but I'd like to see you take a right hot crack at some face studies. If you like, you can look at Gottfried Bammes' book, or some sculptures by Arno Breker. An easy way to look at it is like so - the face is just a framework of horizontal and vertical lines that intersect with each other to form a box-shape with ovoid characteristics. Develop on that idea with the same enthusiasm as these burly blokes here and you'll be on your way to something special!