How can I recover a deleted photo from my camera?

Yesterday I took a really good photo of me and some friends, and I really loved it. But one of my friends didn’t like the way she looked in it, and so whilst she was looking through my camera (which is a Fujifilm if that’s of any relevance) deleted it. >:(

I’ve downloaded I don’t know how many free trials of recovery software, but none seem to be working. :( Does anybody know a guaranteed way of recovering deleted photos?