Being studing anatomy on uni and trying to use it in 3d now. No skin neither ultra realistim attemp, just trying to learn the mucles structure. More to come...
Many of the muscle forms you have on the back don't appear natural. It does appear to have skin. So are you aiming for relaxed, or flexed? Normal size, or heavy weight bodybuilder? The upper bands of what should be the latisimus dorsi have an odd shape compared to the rest of the muscle. The lower lats should appear more solid and superficial with some evidence of underlying erectors. The space between the trapezius needs to be higher and less defined, as there is still tendon there along the spinous processes, and I believe it's a space between 2 of the 3 muscle sections. To simply add it to a muscular torso is very cliche. Lower Trapezius muscles need to run lower down the spine, to the T-12 vertebrae, overlapping the lats. The traps on your model also have unnatural shapes. Remember muscles run in bands or fibers and are stretched between each attachment site and their tendons. For the front, another band of the abs should run over the rib cage, not under, making the costal cartilage of the rib cage less defined. Don't forget the obliques. Nice modeling.
Just a practical tip, try colorizing the different muscles with vertex colors while modeling (very handy feature in Wings3D, not sure it it is possible in what ever app. you are useing).
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And you pointed out some really great points... will work on that