Oh now this one caught my eye
certainly one of your better pieces I think. The colours are exceptional, very interesting and enjoyable. The dark pure contrasts, such as at the bottom of the piece (and the smooth flow of it) set this piece apart from the mostly-lit pieces I see too. Only suggestion which I think is important is that the lightness of the upper left stops at the lower right of the nebulae. What I am conveying is that the right side the nebulae should also cutoff with lightness at the edge of the canvas (whilst keeping the bottom half of the image purely dark as it is). The fact that it cuts off suddenly seems to be a compositional flaw to my eyes, as it seems as if something should be there (which I think would be the lightness that the other side of the nebulae has).
I would favourite it if not for the last part of a slight emptiness to the right of the nebulae.