WorldWalker128 said:

Her hind shoulder(?) seem a bit disproportionate to the rest of her body. I suppose you might be able to cover it up with a Celstia-fat-butt joke, but an easy way to fix it (visually. I don't have SFM or Gary's Mod, so I don't know how hard in practice it would be) would be to make her body a little bit longer and round out her barrel a bit so that it's more even with her hindquarters. As it is now her hindquarters overlap her barrel.

Other than that, I enjoyed it.

Hmm, art thou referring to the way her hind is more pointed up?

That was actually done on purpose. You see, I was going for more of a 'presenting' pose for her, while still remaining a bit in the realistic zone by keeping it within skeletal capabilities.

Here's some images I used for reference.

http://i.imgur.com/0BTk0VW.gif

http://i.imgur.com/5JPo91M.png

Going by these, and keeping in mind the odd flexibility these ponies have, I angled her to be more curved rather than natural. Humans do this, and even have a dance based around that flexibility.

So, I figured Celestia being over a thousand years old, must have experience with comfortability in mating; thus giving her a curved posture, making the illusion that she's shorter in length.

I was going to try and show how she's curved, but that would mean her wings would be extended, and would take too much space; or she flat out wouldn't have wings.