Ooh I can see why you were happy with this one. That is nice.
Only comment and its minor is perhaps a tad too much magenta. Selective colours tool in photoshop set to blues and magenta and reduce magenta and also add some yellows to the blues would probably bring out more of a nice shade of blue.
I am not sure galaxies are magenta hued and if they are then I imagine that is due to colour extinction (although M83 is high in the sky at the moment) or perhaps red shift from it moving away from us. Or we are seeing it through a patch of dust.
You got the Ha areas nicely showing which you don't often see.
Greg.
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