Sometimes you have to play around with the prompt and where you place a particular detail.
I tried a few times with small variations to the prompt and got a lot of images showing wings behind the character.
Examples
The prompt below gave mixed results, mostly inaccurate:
"woman seen from behind with spread out wings growing from her back"
Got better results with: "woman with wings on her back" (included a style)

The image below was with the prompt: "wings on woman's back" (no style)

So my advice,
...