Arm muscles seem well structured, seems you have more experience with them.
On the leg what stands out is that the Rectus Femoris is pushed up a bit too much. Even though it's squeezed in between both Vastus, it still pokes and connects at the knee
Also worth looking at the overall form of the gluteus maximus and medius, especially the medious, since it ataches to the bone at the side. I guess a simple way to see it is that it "covers the gap from the hip bone (ilium) to the femur"
And then the gluteus maximus covers the other gap over it and behind.
All those intersecting muscles get rough though, I've still to learn more about the back of the leg.