Yeah, watch the anatomy. Great pose and coloring, but you need to pay more attention to the muscles. For instance, look at the size of his head compare to the bicep/tricep area of his arm.
this pose is from another artist...and from another artist...ect..this pose didnt originate from him nor did the muscles...and as for the anatomy thing...just because the muscles are big doesnt mean that the head has to match as well. Key example: research body builders. Muscles grow...not your skeletal structure or in this case, your skull.