First attempt at Photoshop illustrating, so it's probably bad, but if I do more of this I'd like to have this video here so I can look back and see if I've improved.
Also, if you don't know, Oblivion gates are from a game called The Elder Scrolls IV: Oblivion. Basically, portals to a hellish other world. I did this because my current art project is based on "windows and doorways", and I wanted something that looked cool :P
Music credited to Jeremy Soule.
deviantART: http://mr-deski.deviantart.com/