[Ebony Stardust]

A visual explanation of how I draw legs, which is based off of my own observations.
I apologize for the poor handwriting-- the panels are transcribed and elaborated below.

Top Left
Animal:
-The first two segments are drawn as one swoop at varying tightness
Anthro:
-The second segment is drawn separately from the first, emphasizing the leg's shape

Top Right
Human:
-Straightened leg is, in fact, straight
-The weight is on the heel
-The foot, from heel to toe, tends to be one uniform shape
Anthro:
-'Straightened' leg is usually still bent, for balance
-The heel rarely if ever touches the ground
-The weight is on the toes

Lower Left
Human:
-Thigh and calf segments are usually around the same length
-Standing on the toes strains the calf
-The human foot has smaller toes and an overall shorter foot
Anthro:
-Thigh and calf are still about the same length as each other, but are proportionally shorter compared to the human's
-Longer foot; toes length varies between creatures
-Toes are, however, proportionally larger than a human's

Lower Right
Human:
-The folded leg tends to appear rigid
-Note the short and uniformly shaped foot once again
Anthro:
-The folded leg is springloaded, ready to kick or jump
-Note that straightening the foot area would strain the front of that joint

This isn't on the image, but here's a tip:
It is helpful to note that the leg has three joints and four segments: the green circles indicate where these joints are located on both the human and the anthro leg.