Do you have hand closeup photos from your photo session? I always take closeups of faces, hands and feet if they're showing.
The son's hands do look dirty, and look like they belong to a much older person. In Howard Sanden's video on hands he recommends that you simplify, simplify and lighten the lines between the fingers more than you think you probably need to.
I wouldn't even out the background. I like the texture. I'd like the background even more if it showed a gradation of tone perhaps, that followed the direction of the light in the painting. You can do a lot to concentrate attention on a center of interest by controlling where the light is in the background.
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