This picture shows movement because the girl is twirling and dancing. The birds are flying to the left of her which is creating a lot of movement in the picture. This picture causes you to think about the birds flying and dancing.
Trees, nature's condos for the little guys, are not just a pretty picture. Squirrels, birds, and bugs count on them for a place to live. (I know the lens is about trees and not art. But I love that face-in-the-trees illusion artwork.