Very cool shot! I am betting you could process this raw twice, and manually
blend them to get the land to match the sky's exposure more closely. Great comp..
It sure looks pretty nice, but 2 things don't quite feel right. The exposure of the balloon compared to the rest of the image, and the balloon seems a bit too sharp compared to the sharpness in the rest of the image.
It's a pretty good attempt on merging two photo's, but it falls just a bit short for me.