In my experience, and those close to me that have told me theirs, I have learnt that most SL relationships initially are fake to a lesser or greater degree. Fake pictures, exaggerations on income and job, marital and relationship statuses, declaring love after a week, height and weight and age, etc etc etc. Fantasy within fantasy, roleplay within roleplay, or just basic self protection.
The man sending you fake pictures is no worse than the woman sneaking out to phone her SL partner while her RL partner is asleep or out with friends. Both are grounded in dishonesty whether its to your SL partner or your RL partner. I think the real relationships here in SL come with time and patience. Over the weeks and months we open up more, feel more trusting and get to a point where you have to be totally honest if you really want something to work - the other person can either understand and accept your reasons for being dishonest, and that might be just as simple as .. "well, I didnt really expect it to go this far", or they simply cannot. Thats their perogative. Though I personally dont think anyone is black and white here, just various shades of grey.
I have had what I would call two SL relationships that were very real in my RL, at least where feelings were concerned. Both began dishonestly in some form or another on both sides. Not everyone can understand or forgive or accept it when that person eventually tells the truth - though I wouldnt advise leaving it til you step off the plane to meet someone as Carter described.. thats just crazy.
As soon as you feel the relationship is having real implications in peoples lives.. its time to fess up !!
Also, just a point from the OP's main ops thread. Some of us lie about our jobs, because our name and occupation could give you the location of our work with a quick google. I actually dumb down what I do for a living
and respond with something I study part time. Fake doesnt always necessarily mean worse. I have a friend here that doesnt tell anyone she has two young children for obvious reasons. She asked my advice should she tell her partner yet, after 1 month.. my advice was NO. If she feels still uncomfortable enough to have to ask advice, then the truth can wait as far as I am concerned.