Nice composition, nice style. This is a very successful image. I like very much how you have a diminutive upper arm, a massive forearm and an even more massive hand. The leg doesn't get this same treatment. right from the hip it is quite thick and it just gets a little thicker as it comes forward. Because of this I think the arm is much more successful than the leg. You also might want to make the difference in length between the arm and leg a little more apparent.