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I think you'll find you can compress your highlights and boost shadows a little more in a panorama like this. This is the problem I was having when stitching with an old laptop, the final output took so long I couldn't bring myself to adjust the raw files again and restitch if I didn't like the result. I have since bought a new computer, 32 gigs of RAM, a 480gb SSD and am now able to stitch fairly quickly. I can now compare the stitch of http://www.flickr.com/photos/robert-young/8578109701/ with my first attempt a few years ago (of the same photo) and I seem to have to pull exposure, pull the highlights, create an s curve tone curve to increase contrast and brighten the midtones and then push the shadows quite a bit as well, just to create an image which has deep colours, tones contrast.
I think it is due to this technique creating a higher dynamic range than a single shot, even though the exposures are the same. You could probably get away with increasing the contrast and pulling the exposure a little too. But great first attempt, no stitching errors I can see and a nice subject to try it on, just could do with a little more processing to make it pop, and maybe some purple fringe reduction as it appears the branches of the tree are quite purple but this could be white balance