[BrunnenG]

I have to agree with everyone else, Very Cool. I can't pick on the mountain or sky at all...beautiful.

I sat here and looked at the keep trying to pinpoint my feelings on what was off about it.
I feel like I am on a peak across from it on a level even with the peak top. I feel like I'm looking down at the keep but the bottom edge of the opening is drawn as if I was looking up at it from below and it just feels off. Plus with no other vertical reference it looks like it is leaning back.
If the viewpoint is from above you could give the keep a sense of scale by adjusting the bottom edge and adding a courtyard/entrance area with a caravan road cut in the rock leading to it.
I know, hard to do unless there are sufficent pixels for detail.

But a fantastic picture none the less