A very nice image with the lighting to be just about right. The texturing is smooth around the edges of the model, which is always nice to see coming from GMod. There is a perfect sun glare and the darkening background helps bring focus to the image while not being so much of a distraction. Also, the colors are very well balanced as no color overpowers the other, not even the sun.
The only slight issue I'm having is that the pony's head is turned toward the camera as if to say, "Yeah, you know you love this image!" It kind of gives this an arrogant air to it and that detracts from the overall composition. What would be better is if the head was turned toward the sun so that viewers could enjoy the overall beauty without feeling like they are looked down upon as minions.