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Another interesting technique, it is a bit enhance color of nebula. Duplicate (Cmd/Ctrl + J) nebula layer and use different Image adjustments. Then reduce the layers Opacity to balance the color of your choice (This is not necessary if you are satisfied with the source of its color. I did not do it).
Now I made apophysis on nebula (dark areas and texture). Create a new layer (Cmd/Ctrl + Shift + N). Select foreground color from background only which is a bit darker than the color on which you choose to apply apophysis. It is very easy to do using Eyedropper Tool (I) (When you use Brush Tool (B), hold Opt/Alt to switch on it). Upload "Galactic Space Brushes Set" brushes in Photoshop and used Brush Tool (B) proceed to draw the dark details over nebula, using low Opacity (30-70%).