I first saw this some time ago, possibly just after you put it up, but I've never gotten around to commenting on it until now..
I really can't point out anything I specifically don't like in this picture. It's a cute scenario, I love the night setup, the moon and water reflections are amazing, and I really like how you did Twilight's hair/tail. The starry hammock is just a sweet bonus. Basically: It's awesome! Thanks for putting it up here.
Hey, I finally found you! The artist that drew this. I've used this as a wallpaper since I first became a brony, but I didn't know who drew it. I don't even remember how I originally found this. Thanks!