Speculation, what was the embarrassing photo we do not see?

[buckmana]

In When Nature Shrieks, Monger produces a photo of Susan we do not see, but which she finds highly embarrassing.
He says "Your Cheerleader Faux Pas will be kept just between us".

Obviously, the joke was that we do not see whatever it is that Susan is embarrassed by, but what do you think was in the photo?
And keep it clean please.

As an aside, why would Monger take the photo on a camping trip?

[blobman]

I was looking online for deviantart on the topic but nobody came up with anything yet, other then the zombie cheerleader outfit but that's irrelevant. Imagine the girlscout photo, a bit older in a cheerleader outfit, that's pretty much it (to keep it clean).

(Unclean) there are a lot of possibilities that match cheerleaders...