This is true, most (not all) skin creators (myself included) get their references from 3d.sk... and for some odd reason most of the female (and male) legs are either much darker or very red compared to the rest of the body.

I hasn't released any of my work yet (still working at it, but I do however have a product out with a partner)... but the one thing I'm trying to do is to match the legs to the rest of the body, which I've done quite a bit of feather selecting, changing contrast and saturation then re-touching seams to get a decent result cause I too don't think it's natural to have super-noticable color and darkness changes from the top torso to the legs, lol.

And to Latexluv the skin I've been working on is a product I'm planning to release as a brand new V4 Merchant Resource. So hopefully it will be done soon. ;)