You have quite an interesting piece. The depth is great and the detail is coming along. I would suggest that you push the colors more. Do it as you worked the shapes and composition, work with big color strokes and refine later on. I see this as having potential of being truly majestic.
Please finish it! Don't sleep, don't eat, don't drink ... whatever it takes. I'm very sure this will become a beauty once it will be finished. (it already is, but it can be more perfected ^^)
Just a few more days, keep up.
Looking at how your painting evolved, I have to admit it's some real eyecandy. Love the smoke - too bad it aint finished though, you can still work on it later on perhaps? Anyways, still think you got a better shot at winning this ^^
one little thing I must say: the man on the cloud gives the scene the scale of the rest objects, but in this case I think his size comparing to the size of the bridge next to him is a little weird, looks like the both are in the same plane. I dont know if this is the right place for him.. Pay more attention on this