A good rule for writers: Do not explain overmuch. - Somerset Maugham.
Over and over again I hear from published writers that you have to leave room for the reader. It's the reader who paints the scene in his mind from the writer's broad strokes.
Also true for picture book writers. The illustrator is the other half of the story, so you must leave room for the illustrator to take what you have and show the world you've hinted at.