Kerri, the movement could be in the pics or on a LO you could use Chevrons, scallops, scrunched ribbon - anything that is making your eyes move from one across the page ... think of the photo of Santa and the reindeer, your eyes don't usually rest just on one part, they usually start at the sleigh and move across the group of reindeer.
Sound - The pic I'm using for this has my 2 year old GD with a harmonica. I can hear the sounds by just looking at the pic. (Others could not but I can and it's my LO.)
As I have said, before and I continually remind my scrapbooking group a challenge is for inspiration. It should be fun and not frustrating. Don't over think it!
Hope this helps.