I wanted these children to relate more to each other within the scene, possibly by connecting their shadows or their footprints in the sand. I drew a rough sketch of the background on a sketch pad, then each child separately on small bits of tracing paper so I could move them around and try different placements. It was a little like playing paper dolls. By bringing the boy closer to his sister and lowering his position his left hand 'fit' into her right hand perfectly. Issue solved.