With regard to the Ansel Adams shots, my understanding is that they're not any particular shots. If you have a collection that's complete except for one shot, then you can use an "Ansel Adams" shot to count it for the challenge. It won't count on the skill screen.
Example -- You've taken 20 pictures, 10 of which are eligible for the "Happy Sims" collection (made up) and 10 of which are eligible for the "Sad Sims" collection. But both collections require 12 photos to be complete. You add 2 Ansel Adams shots to each, using up 4 Ansel Adams shots, and have a.1 multiplier.
A separate issue -- possibly it's just my smartphone, but traveling seems to erase all the photos stored on the smartphone. You can, however, pull the shots off the smartphone and keep them in your inventory without losing them. Photos taken with the smartphone do count towards your total.
Incidentally, this means that people who don't have WA, but do have the smartphone (I don't know if everyone has this or just people with UL) can do this challenge.