After feedback I've made a slew of small changes to the anatomy as well as establishing the light a little more (letting Earthshine show better for example).
@Mike & Molly
Thanks for the comments! Molly, yes she's good practice for anatomical muscle studies.
@ofnuts
I see what you mean, I have the feeling it's more a matter of the perspective tricking the eye a bit though, especially since the other leg is obscured by the light and thus may seem to be much further back than it actually is (zero-g is an interesting beast here - there is no counter-pressure to the muscles, so just how will the muscles reshape? I wonder if anyone has really studied this). I'll need to hold off on changing the leg, to see if I start seeing it the way you do when coming back to it after a while.
Oh, and yes, the suit has only the big toe free.
@AnMal
Heh, those legs seem controversial.

As mentioned to ofnuts, I'll let this image rest a while, getting back to it with fresher eyes maybe.
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Griatch