This really doesn't make sense to me. The outer curves of the hip and thigh are usually what are easiest; why would that be the only part they trace? The things people usually trace are things like faces, muzzles, fingers, clothes.

I'm not saying you don't genuinely think there is tracing here but it looks to me like you kinda did this:

Example
http://www.furaffinity.net/view/6311013/ (http://www.furaffinity.net/view/6311013/)(NSFW)
Traced from (not really):
http://www.furaffinity.net/view/3925471/ (http://www.furaffinity.net/view/3925471/)NSFW!

Overlay:
http://www.spiffyspace.com/misc/acorn-not-traced.jpg (http://www.spiffyspace.com/misc/acorn-not-traced.jpg) (Still NSFW)