TheMadScientist - 7:45 pm on Nov 10, 2012 (gmt 0)
Hmmm ... That's 2500 impressions, some clicks, some site exposure, some 'site/brand recognition', etc. for free you wouldn't normally get ... I don't know how many people search for 'fuzzy puppies' and are also involved in whatever type of 'widgeting' your site happens to be about, but personally, I'd not worry about 'correcting' the free exposure you're getting, because most people I know have a variety of interests and free exposure is free exposure.
What I'd do instead is work on getting the lost rankings back for the other keywords, but I'd definitely be leaving well enough alone with the photo that's giving some free exposure and clicks while I was doing it.
IOW: Think billboard ... Not everyone who sees them is a buyer today, but tomorrow? Maybe...