Wow wow wow. The silhouetted land, the brilliant vibrant colour and the texture of and in the clouds, seem to say print me and print me big. Absolutely lovely, definition of a fantastic sunset, captured beautfully.
Nice! The amount of dark silhouette area at the bottom keeps trying to pull my eyes down. Cropping about 1/3-1/2 of what's there would improve the composition IMO
Horizon should be lower since there's nothing there of much value... the emphasis here is the sky so there should be MUCH more of it IMO. Hope this comment helped :D Good luck!
Tis a very nice sky, and yes, there is definitely some orange in there. The clouds are a bit unusual too, and adds something different that most sunrise shots seem to lack. It's a bit of a pity that the landscape doesn't do much, but for this challenge it's enough that the focal point is the sky itself (afterall orange is the prime objective here). So, I think, 7.
Always try to find some interesting foreground object to include in the frame to add interest to your sunset/sunrise images. A nice silhouette would work great with this image.