Needs more Spike, though. I mean, doncha just hate it when you see fanart for one of your favorite shows, but one of the main characters has been inexplicably left out, and it just happens to be the one you root for the most?
This is beautiful! I love your uses of color and value. The composition is great too! The one-point perspective on the bottom draws the viewer's eyes inward towards Princess Twilight, perfectly placed between night and day.