lovely.

s'right. Very lovely :) and especially well done for a speed sketch. Show's that you know your stuff well enough that you don't have to chart it all out. Though it's admirable that you still do on a serious sketch/picture :3 The lotus position has always been an interesting one. -But it'd never crossed my mind that the pose could convey anything but stoicism. Yours is more playful innocence with a hint of mischievousness here X3

Mascot feet.

Any ideas on how to improve on that?

Make a decision if the character has anthro/human feet, or animal feet, and then study the appropriate set of bones.

Ahh, her feet is supposed to be a midway compromise of both, so I dunno.

It's so hard to find flaws in your stuff, I'm almost convinced it's one of those trap images that have a scary face and loud noises pop out at you. If I had to say something, the elbow looks a tad thick. *shrug*