Phew. What a marathon. I've spent every waking hour since Saturday working on this, sans a few hours last night to relax a bit due to lack of sleep and, of course, the time taken to maintain my job.
I got the idea on a whim, and I certainly imagined this picture differently than what eventually came out, although I'm satisfied with the results for the most part. The driving force behind this was... "Would Lauren use this as her wallpaper?... more importantly, would I?" (I'm very picky 'bout them wallpapers). It really drove my interest in this image and prompted me to work hard and stay up late every night. While the former is wishful thinking on my part, the latter is at least taken care of.
Though I don't dislike Celestia, I like Luna the best. Not many reasons for it since my only account of her is really Luna Eclipsed (I don't care much for fanfiction), but I guess being a night owl it was bound to happen.
Hopefully I stayed faithful to her form and elegance as a princess!
1080pony for those who want that.
Thanks for the comments, by the way. I appreciate them, whether or not I reply to everypony.