I just can't get over how pretty this drawing is. The jewelry, their hair, their expressions! It's perfect.
(and plus I like the darker skin that you've given Celestia, it makes sense being as she is out in the sun all day and if she was super pale the hypochondriac in me would be worrying about skin cancer and demanding she put on some sun-block. ... It still is a little. .. but I think that's just me)