Sweetie Belle is so amazingly cute and wonderful. When Rarity sees this she'll only think of that and how lucky she is to have such a great little sister, not caring that being asleep also means Sweetie Belle can't destroy the shop. (Then again, maybe she tosses and turns. ) Along with the napping filly, you did an excellent layout for the shop, with the sketches, bolts and tools to make it clear that's the venue; then the breathtaking view outside is another little favor you did for us.
With Sweetie Butt sticking up like that it's tempting to get some markers and draw a joke cutie mark on her. Hmm, that pincushion makes for great inspiration, and it'll make playing "Pin the Tail on the Pony" a seriously more exciting game for her.