At side and back view, the same idea applies. The back view of the leg tends to have dashes | / \ | indicating the back of the knee. You can also do the same at the front using one or two dashes except reversed | \ / |.
One important aspect about legs that you must keep in mind is when it is against another object whether if it’s a chair or it’s own self, the leg tends to widen out. The muscle gets pushed to the side or upwards depending on the situation. Above and the one below are three of such examples.
Top: Leg pushing up on itself.
Middle: Leg resting on chair.
Bottom: Leg against itself and on the floor.
Article source : www.mangatutorials.com/2007/drawing-legs-the-basics

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