Careful. There is a minefield around here.
BANG!! Don't step on the mines!
Just submit a correction report, identifying which pictures are in the wrong game, and to which game they need to go.
Incidentally, nearly every error on game pages can be addressed by submitting a correction. I usually take care of the corrections queue first thing in the morning, and reference back to it occasionally throughout the day.
How does one submit a correction report then? When looking at a wrong picture I cannot see a link to click that enables a correction report to be submitted.