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Hi Leon,
I certainly enjoy the composition of the two objects in the frame. If done carefully you can also frame IC1275, IC4685, IC1274 and NGC6559 together with M8 and M20, using the FSQ.
By the looks of things you're black clipping the data (see histogram attachment). You may need to stretch your data further. Don't set the white point too low to start with otherwise you'll white clip as you perform the non-linear stretch (curves, DDP or shadow/highlights) on the data.
The histogram in the attachment is marked from level 0 to 255. level 0 is far left (black) and level 255 (white) far right. The goal is to see the black point (level 0) to start (or close to) zero and rise from there. As you can see from the attachment the left of the histogram of your image. Level 1 has 44187, not zero or around this value. Thus you are loosing too much information, hence the reason why the background sky looks unnaturally dark for this rich star field region.
This is trial and error mate. Have a play around to get a feel for what the histogram tells you. Once you understand the histogram, you'll be able to extract the maximum information from your data. I use the histogram reading regularly for different tasks. Its an excellent too for simply evaluating the quality of the data you've captured. There are plenty of links on the net explaining its function. I feel certain others on this forum can also lend a hand.
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