My first reaction as a mother is to play down the size difference. Perhaps have a set-up where he is actually closer to the camera so that he is larger on the canvas? That may be unusual, but it could solve this problem. Of course it may make him seem more important in the painting.
Just my rambling thoughts on this. I want to see what others say also.
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Kim
http://kimberlydow.com
"Speak your mind, even if your voice shakes." - Maggie Kuhn
"If you obey all the rules, you'll miss all the fun." - Katherine Hepburn
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