I see what you mean about the sky. I had a lot of problems with the sky; but the sky isn't pasted in. I had problems getting the edges right--where the sky meets the church/trees. At first, there was a light edge around the church/trees where I didn't to a very good job of masking and the original sky was showing through. I went back and darkened the edges around the church and trees. I probably would have been better off starting over from scratch.
Thanks for the feedback.