I like your anatomy studie, I think you could maybe bump up the descriptive quality of the information you have there. On some of these, I get the impression that a lot of the muscles appear as blobs on the body rather than bands of muscle fibres that have their own origins and insertions. Also, identifying tendon from muscle can be very helpful, like some of the arm studies. Above the elbow is a sheet of tendon that the Tricep Brachii inserts with and it is a great landmark for orienting yourself along the complicated anatomy of the art. Extreme examples of this sheet can be seen here
http://3.bp.blogspot.com/-hDZgQXON1mk/Ur...sktop9.jpg
On the legs I'd also note down the Patella's tendon that inserts with the Tibial Tuberosity before describing the medial surface of the Tibia. The Rectus Femoris inserts with the Patella through a fairly long tendon instead of having the muscle fibres taper down all the way.
The Facia Lata isn't with in your drawings and I think including it would give much needed context to the knee area. The same goes for the tendon extending from the Extensor Digitorum Longus, it really helps describe the volume and tapering nature of the lower leg.
Anyway, not gonna nit-pick your drawings to death. Keep 'em up. Also, noting down that names of things can become very helpful in orienting yourself around the anatomy :)