-Her face is horrible, and these two people look completely and utterly bored with sex with each other.
her cheek bones make her look anorexic....yet she has bulging muscles...
-Colouring is stale and boring, not enough variety in the colours used. EVERY part of her body receives the same amount of light. That makes no sense, surely there should be a shadows under her arm for starters.
-Muscle defination is so so, some places are odd but the main problem is it looks like her skin is SHRINKED WRAPPED onto her body!! For some insane reason all the muscles are defined, Yes muscles are more defined in muscular people...duh but you've gone overboard.
Also muscular bodies ARE NOT SMOOTH, if you look at pictures of muscular people you will see that their bodies are very angular, which is something you haven't got across with the shading. It just looks like you just used the blur tool on everything.
-Wtf is up with her fingers, they arnt spose to be that thin even for a normal person let alone a bodybuilder.
-veins, veins VEINS!!!! where are the veins?!? some one that muscular would have quite a few budging veins.
Overall this is bad, really bad, and no cares at what resolution you did it at.