Hi Ziaphra,
Nice, clean and nicely blended selection/extraction!!
Great honeycomb pattern removal!
What I'd do differently is using a gradient instead of a 'flat' one colour background ... and yes, I tend to agree with
goose443 about the boy's colours ...
There still seems to be a light reddish colour cast on the boy which makes the image look a bit lifeless..
Even though his ball and shoes should be white ... or nearly white, they look a flat kind of reddish beige on my monitor too... just a couple of shades lighter than the background...