great allover work, I like the dramatic and dark appearance with the sparkling little “dots”, also the mood is wonderfull.
now for a few thopughts:
Its not that obvious yet the sparks are her blood, you might try to add a desaturated red maybe to illustrate its blood, a decent red should already add nuf colorcontrast, since it is complementary to your all over green/cyanish colorscheme, and it still should stay quiet goth.
for a better separation from the background, you could try a decent amount of backlight like the litten up edge on the right side of your girls skirt.
the branches of the treepart acually look a bit flat, if you want a ghostlike/etherial effect, its ok, but i suggest to give em highlights in the same lightsetup her roots are illuminated, this should make em look belonging together.
for adding a sligh bit more depht, attenuatuve colorfalloff towards the horizon into a colder greayscale offers to work in in the foreground a few warm greys.
of course these is just my point of view, and i hope the one or the other idea is sort of helpfull
Keep it up, cheers
ps:i checked the rest of your gallery and i liked it a lot.