Great Idea for a game.
Some possible improvements:
-more levels (obviously)
-don't worry about making your own pictures. It would probably be worse (nothings better than the original, right?)
- add music (something low and instrumental, nothing that would distract people from the task at hand. Also, make the mood of the music shift with the overall theme of each level.
-I like how you had the two people you need to find, but you could also have more objects as well (don't make too many because people will loose interest if they are stuck on a level for 5 mins)
Good idea for the game, and very well executed with the magnifying glass. Now you just need to add polish and expand it. Good luck.