Nice job. This is a little difficult on the eyes. Next time try fitting less drawings per image and also putting a white layer behind the drawings. It would make easier to the person giving feedback. So on to your drawings. You did a very good job indicating the muscles and make them look 3-d. From what I can tell it's not that you're misunderstanding something it's that (at least is my impression) you're not looking at the reference with enough attention. I know it may sound like a general thing to say, but when doing these exercises you should look for clues first and draw later. In the left leg you have indications of the sartorius, the abductor Magnus, the quad and the bundle of tendons but they look slightly out of place in your exercise. In the right leg the glutes are as highlighted as they can be yet they are in the wrong place in your drawing (the tfl is way high). Try redoing this exercise in three parts. First trace it. Pay attention to all the bumps and where they are. Second use the 3d model or anatomical charts to identify the muscles. This part where you research is when you learn the most in anatomy. Third redraw your exercise using what you learned. If you have premium you can also watch Stan doing this exercise. I think he cover a lot of doubts. Another general guide is to never obsess over where exactly the muscles are. You just need to put stuff in the general area and make it look believable. Keep drawing, don't get discouraged and best regards PS.: if even after redoing the exercise you still have doubts hit me up. I'll do this exercise with you (it may take a while, I'm really pressed for deadlines)

Hmm... I thought the adductors would stretch out to a thin bundle and the rest above would be the hamstrings (that we didn't learn yet). Not easy to see or imagine everything anyway. More studies.

Thank you!