Oh you can absolutely do that. The prompts are supposed to inspire and I'm glad this particularly creepy one is doing that for you. If you can't finish the story for the due date, just post it for the next Tuesday Just be sure to put the originnal date it was due in the subject header along with the phrase 'for Picfic Tuesday' as well as your title.

I'm looking forward to reading your story!

Thanks for asking. :D