I found these really interesting and fun to work out, try to do them yourself first off but if they get hard, as they do, then use guides.
GUIDE TO FIRST CHALLENGE:
The first one is tricky but if you look in most of the pictures they will be holding an apple/fruit/ball of some kind, symbolizing the piece of eden. Select all of the images with this "piece of eden" in them and you will complete the challenge.