I always thought that maybe sombra was a good guy but the crystal heart corrupted him and any who uses it became corrupted and all he was trying to do was guard it from others to spare them from the darkness. There i go again rambling good job dude that is epic as hell.
It's actually kinda all of him. Remember? Celestia said he was turned into shadow.
But this is amazing for 30 minutes. I wish I had actual talent... all my art is mostly just luck combined with multiple tries. The odds of me producing good art to bad art is about 1:9. And that's using "good" liberally (look at my crappy gallery for proof).
I like the use of color and the painting technique is appealing, but to me, he doesn't look very much like a unicorn design from the show in this image. The shape of the head, the neck, and the size of the fangs seem exaggerated. If you told me he was supposed to be some kind of dragon, I'd believe that more.