That is looks really so beautifull. You really drawn my favourite pony Rarity perfect and honoured her a lot, you did an awesome job. (\s/) Post it here: www.facebook.com/MLPandEG Will give credits and linking to your profil and this artwork. /)
Its fun that Rarity wanted to show the nobles that she could be just as regal as they are despite her back water upbringing but yet it never occurred to her to seek-out becoming a princess by way of virtue.
You impress me with the gentleness of your lines and coloring. Your Rarity looks very regal, but doesn't lose the edge of adorableness that is characteristic of a pony, especially with the distilled sugar that is that smile.