Indigo, you're treating the pecks like some sort of mutable film. While they are indeed flexible and will hold and support the arms in any position, they are still pivoted at specific points to the chest. A peck will not rise independent of the bone structure below it and that's why it's a good idea to study what's underneath the muscles too. You have a deep shadow under that peck that you probably should smooth out, I'd say. Also go ahead and place the nipples in non-vague positions so that can be examined I'd say.
As a muscle study it's okay, but it's missing hands and two legs. I know it might sound pedantic that I write this, but really you should finish all the body in such sketches. If you had, you'd see that you need to give support for the pose in the end, and that the feet must propel the center of gravity in a meaningful way. Furthermore, hands and body language would further explain that your anatomy study, even as an anatomy study, must emote something. The body must be trying to tell some sort of story. Otherwise as it has been noted, it's just a drawing of some naked muscle. I'll take an anatomically faulty but emotive construction over a hundred muscle-impressive, dense and angular-cool looking figures that do not seem to serve a meaning.
The post by Rosse is one that finds me in agreement also. Bengal is good but you can see how his art evolves out of anime-cliche and as such the bodies he draws have that sort of effect about them, making their language somewhat stilted at times, I'd say.
One thing to mention at last. You should be an artist first and physician last. So learn as much that you can communicate your message but as less that you keep loose and not end in stiff, over rendered muscle men.
Facial characteristics all squatted at the bottom of the face. Time for face studies not just body studies! Furthermore I guess, short torso, very small legs and waist.