To start off, this is a great wallpaper and requires very minor constructive criticism. The background looks great and gives it a bit of a mystical feel that came together quite nicely. This is also quite a unique piece because it uses a background character who we can only assume had an impact on Equestria. The lighting of the piece could be improved in my opinion. The shadowing is fine and the darkened corners look great, however the brightness of the spell that Starswirl is casting takes away from the character a bit too much. It is a bit too big and covers a large portion of the wallpaper. I wasn't sure if he had a horn (Without assuming) because it covered up that area a good amount. I think that that is about all I would say could use improvement. It is still a great piece that looks magnificent even with the large brightened spell.