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Pic 1 is the best by far. You've killed the star colours in the other shots.
Assuming this is a DSLR capture, i havent done tarantula yet myself but from memory shots i've seen were a bluer nebulosity and i assume those were due to filtered shots and processing (Ha O Si etc).
That coloured region on the left I think is glow, and shouldnt be there. Its like an internal reflection from a cheap lens element. It should be removeable with a gradient removal tool. Alternatively if you can reshoot, try to see if you can rotate your camera/sensor around 180 degrees and see if the region moves and you can combine the two sets of captures to help reduce its prominence if you have no gradient tools.
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