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Re-shoot it. The blown highlights here overwhelm both faces. You can use this pose, but you need to shoot more centered and slightly lower, and include more of your wife's body, if you don't want your son to be so dominant.
Regarding the vignette, the vignette should look very subtle and natural -- not like this where one looks at this picture and thinks: "Oh yes, he definitely decided to use a vignette here." It's just so obvious. Just my opinion/style.
I agree, blown highlights and heavy vignetting