Dunno what's going on exactly since the original pixiv post isn't tagged with any copyright, but this is either flame = glass or pretty much an exact copy of her, down to the pose used in the official art. Because the top is missing the o-ring and other details, I can't be 100% sure which it is, but I've added the character tag for now. Compare post #1270569; zoomed-out the silhouettes are uncanny similar.
The way the artist omitted the most distinctive features of this character, one of which is the red-blue heterochromia makes me think this was meant to be derivative work.