Tis' a great image Humayun, but feel your white balance is out. The small cluster M4 should show a brilliant white. The yellow cast over the image is dampening the other vibrant colours of the region. I commented on this image many moons ago, it is one of the finest examples I've seen of the region using a DSLR. Exceptionally well done. Subtle adjustment to the balance would top this off.
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