ok, this pic is 'old'. But hey, its the only one i've got uploaded at the moment. C&C wanted.
Please resize the image.
About the pic the marines left arm muscles are wrong and the right arm seems too much twisted. Other then that i farily like this
yeah you gotta size this sucker down :p also take a step back and look at your drawing; the marine's arms/legs seem to be a bit too thick and pushed together, making it hard to discern where one muscle ends and the other begins. If you can look at someone else's (or your own) arm for reference, you'll get it right.