Purple Heart

Great work, the star pattern in the distance looks very real, the galaxy/ nebula pattern looks great the color range is nice, it goes from blue-purple and has some spots of reddish hue and even a white area which is good, the color variety is key in these types of art.

the wisp-y effect of it perfect. the jumps from high to low opacity, areas are appropriately transparent and then opaque.

Can't think of a lot advice as far as improvement goes, i would maybe say more variety in colors adding small barely noticeable hints of red or green might help it pop more. but choosing a dominant color is important and i like your dominant color choice!

and the black "space" are seems flat (as it should be) to jazz it up a bit maybe you could experiment with distortion or blips of negative color (in this case it would be white)

going against reality and making some as bland as empty space more visually interesting is a challenge, this is where you talent in artistic vision could shine and add more originality to this piece.
keep it up fantastic work overall!