Just a note to say that I achieved this wish after my first trip to France. I was really pleased, as my Sim is still a teen (one day away from becoming an elder).
I didn't go about this wish in anything like the right way--my Sim did not have the photographer's eye trait, although she was artistic. She started as a child with the cheapest camera, and all the China pictures were taken on that. She had the fast-learning lifetime reward, and mastered the photography skill as a teen in Egypt (she may be only a teen, but she's taken four holidays that were 6 days or more long, and most of her pictures were taken while on holiday). But I completed it as soon as I put up the tenth picture from France. I think the fact that so much of this lifetime wish has to happen on vacation makes it time-consuming, but that time doesn't count against your Sim's life, so it's quite a good one.
Anyway, I thought I'd mention it as encouragement to anybody else thinking of this wish. It wasn't actually as hard as I thought it would be in the end. The biggest pain is that you end up with pictures plastered all over your house.... I need to take them down now.