I really like your design of Celestia and the background as well. I particularly like her eyes which is strange because I normally find eyes without the pupils kind of creepy. I find it kind of weird that she has the golden leg armor on and not her crown but I actually like her without the crown on. It's something you don't see every day.
I tried to add the crown multiple times, but I couldnt make it work so I decided that she'll have to be content with just wearing her shoes. Same goes for the necklace-thingy, I guess it's because the style is rather simple and those two accessories were adding too much "complexity" for it to work. Thanks for the feedback