I don't like those legs, the poly distribution and hape seem odd but of course I can't say anything about your accuracy since I have no idea what you were trying to make (show a concept!). The joints don't seem very deformable to me and generally don't appear to have much thought about how they work put into them but as I said, I have no idea what you were going for. Also why aren't you showcasing one of your complete models instead of a pair of legs?
From what I see and think I'd say you're 2-3/10 on a scale where 0 is "my first model" and 10 is
godlike.