I like the idea here with the unusual angle making the boy even smaller, and the photo more touching. I think it is a pitty the corner of the stone touches the frame though. Also I find the framing of the flowers a bit abrupt.
Every inch of this photo is beautiful, colors, all. Very beautiful idea, feeling... Is the boy your son? Alwasy to be remembered. I have one of my dear aunt that makes me remember on and on.