Hey Sparklecadet,
Here's a link to get an idea what you can do in a prompt to any story:628Please respect copyright.PENANAay6UO2DqTF
https://www.thoughtco.com/writing-prompt-composition-1692451
It is vague like many others say and misses the punch to attract others to continue reading. Especially the first and last sentence are of importance in this situation.
I checked your prompt. You can take out the first sentence would be my suggestion and mention the details in the following sentence.628Please respect copyright.PENANA6VKcjfE1vd
Another point, I know many fanfictions but here I can't sort to which you refer to aside the credits at the bottom. If the picture should be self-explanatory then my bad ^-^'
Another suggestion would be ending with a question that would intrigue the readers.
I understand you don't want to give too much info and keep the surprise but hinting towards it wouldn't hurt.
You can take a look at my stories and their prompts to get an idea on how to write them.628Please respect copyright.PENANAYXW6jwjN5V
All suggestions and ideas ^-^
Cheers!
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