Possible Clues:

• Artwork
• Artistic composition
• Just picture how all the inside is not in here
• See 27-Across
• 25-Across, e.g.
• May be still life in dog's breathing, I'll be bound
• 'The Mona Lisa,' e.g.
• Just picture losing breath about one
• Very eager to put one in the picture
• Is not in the inside - all outside