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I have had trouble processing them because of dust on the sensor. Flat Frames will correct for this and for the circular illumination gradients. Flats do not correct the colour of an image, which you will need to do in later processing. I hope this helps as the image has a ton of promise.
Cheers,
Nathan
P.S. Try taking the Flat frames at evening when the sky seems to be sort of whitish but not bright blue. Then take your exposures with the telescope pointing to that area with the dust cap off with the histogram from the image looks to be about 1/3 of the way across brightness wise. This might be 0.2 to 2 seconds depending on the camera/CCD. Repeat for each filter if it's a mono or just the once for colour and try to take at least half as many frames as your light frames. Just add these when you are stacking you images and go from there.
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