Looks good!
I think that the main issue is the gradient you have from top to bottom - do you have some light pollution creeping in from that angle?
More subs would definitely make a difference, and it was good to see you stopped the lens down to f5.6 - it reduces most of the chromatic abberation. It would be nice to frame it so that you give Eta Carina a bit more room in the bottom left, as it is such a focal point. You really get a good impression of its sheer size in widefields like this.
I like the FOV that the 50mm gives - sure its not the wide, sweeping vistas that something smaller would give, but it sure does give a nice sense of scale when you see the cross and eta carina all in one like that.
Cheers
Adam
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