Yay! I finally finished it! ^_^
I'll probably tweak some things a bit, but for now i like how it turned out. Hope you like it, too.
Celestia took me 26h, Luna another ~6h and the rest ~5h, so in total about 37h.
Inspiration was the picture used in the song "Lullaby for a princess" from Ponyphonic ([link]
I'm happy about every comment and / or critique, so don't hesitate to write something