I absolutely love the oranges, yellows, and pinks of the sunset. They really compliment Princess Twilight's different shades of purple. In a way, she blends in with the background, yet stands out at the same time. The originality in itself truly paints a picture; Usually one would see Twilight studying, or at least indoors. But this portrait demonstrates relaxation; How even one of the busiest ponies in Equestria can enjoy the peace and tranquility of such an outstanding and divine performance of natural beauty. Though the visual work is nice, I think there's a much larger picture painted behind it.
Ah, I really like that - a very serene scene (a scerene? ). Nice to see that Twily's still able to sneak in a quiet moment every now and then, too, even with all the princess-ly duties she no doubt has to take care of.