hey. You obviously have some talent. However, it looks as though you are “faking it” with some of the anatomy.
For example: The leg muscles (quads) are close, yet off a bit. The sartorius muscle (which bisects the upper leg starting from the hip, and ending inside the thigh just above the knees) is absent. It is not always pronounced in most anatomy studies, however in a hyper-realistic depiction like this, you would probably see it, either way, this muscle has a large impact on the overall shape of the leg, and should be considered. The rectus femoris muscle is way to high on the thigh. This muscle has a large tendon connected to it that covers over the patella.
There are some other issues with the anatomy, but im trying not to go overboard. Have a good anatomy reference nearby at all times
Also, I have bought muscle magazines in the past and even though they are not ideal as anatomy references, they do help put some of the confusing bits into context, like the quads or the muscles and the surface anatomy in the back.
Just trying to help. Like I said, you have the talent, just a touch up on your anatomy. Hope this helps.
K