Blue, blue, blue. What do we do with you?
I think you will find virtual unanimity among the guys that a provider posting an ad with pictures that are not her own is wrong. You may
think you are posting a picture that is 'representative' of yourself, but people (both male and female) have an image of themselves that is not always in line with reality. I am not saying this about Blue in particular, just in general.
You could get around the accusation of "deceit" by saying in the ad "this is not a pic of me but one I think looks similar". But then the guys seeing it will think to themselves "yeah, right"!
You can post pics of yourself that do not show your face or distinguishing tattoos or marks. If you are not comfortable with that, it is best to not post pics at all.
Of course as I stated before, we hobbyists are a lazy lot, and so we are drawn to those ads that have a pic, rather than sending an email or pm to acquire them. So you have to weigh the pros and cons of safety vs. the enticing pic. But to post a fake pic is just asking for a bad rep.
To slam hobbyist's tools, like tineye and review boards, is not a good move (<-- free advice). But you are correct in saying that to use one tool like tineye alone is insufficient.
Now as soon as the planets align, we will have that FootLong and Blue Lady reunion...