I just fell in love with art. And the way you drew her so anatomically correct, with that amazing mane and that gorgeous tail... you even did that ladylike sitting position on the chair. I don't know how to describe this as anything but perfection. Must be hard to work in such a position for hours on end.
Also, Opal looks like a bunny. That's so cute how kitten like she looks here. But hot damn you did wonders on her mane and tail. Just wow.
It's a really lovely view of the exhausted pony, so caught up in her inspiration that she really tuckered herself out. Good thing she can balance on her rolling chair and the sewing machine so well, but I'm guessing this pose is well "practiced." You matched the lovely flowing of her mane and tail with the curve and flow of her body and all the shapes and shadows. All very sleek and smooth with a slightly ethereal feeling. The high viewpoint does a sweet job letting us fully see everything that conveys the quiet mood as Rarity slumbers under the bright workshop lights. (I wonder if the artist here is often in the same situation. )
Let's just hope that Opalescence isn't planning to spoil her pony's little nap.