An informal photo collection can be playful and still benefit from a thoughtful edit. Look for images whose humour or surprise comes from a clear visual relationship.
Make the visual idea readable
Check timing, framing and the background before relying on a caption to explain the picture. Several photographs of one moment can reveal useful alternatives, but the viewing set rarely needs every version.
For sharing, choose the images that make sense together and consider the comfort and privacy of anyone shown. A light tone works best when the selection respects its subjects.