First off let me say I enjoy the picture, I think it's really funny.



With that said allow me to offer a bit of constructive criticism. The line from the bottom of the mouth to the neck is the jaw line, it's a single line that curves to accommodate the roundness of a ponies head, but doesn't bend when a pony opens his or her mouth. Instead the angle of the jaw changes to allow it to be open just like how a human jaw works. The ponies' jaws are just longer. So the way you have it drawn Rarity's jaw looks broken or mangled.



I don't personally feel the blush looks that bad, the only other criticism I have is that the pillow behind Rarity's head blends into the background a bit too much making the grey side of it look out of place.