My first thought when seeing this shot during voting was the blue cast to the image. When you are shooting in shade, if the auto white balance is not doing a good job, you can manually set to shade or cloudy white balance and this will correct for the blue cast. You can also fix it in photoshop with the colour balance tool. This also has a very high colour saturation with the red and green complimentary colours, and the bright happy look is a little in contrast with his cool model expression. With a shot like this, the focus is his eyes, so be careful about bright blocks of colour which will distract from his eyes. For the composition and crop, I would consider maybe giving the photo a bit of an angle, so he is leaning back into the frame, with his head more upright. I'd crop off the bottom of the frame, so you don't see the checkered pants, desaturate and darken the background, and lighten his eyes a little in PS.
Love the bokeh, great use of complimentary colours, and the composition is good too. His eyes really stand out too. I think the focus could be a tad sharper.
Your kids are so beautiful. Love those eyes! Does he really want to be a model or is he cooperating so it gets done faster? lol Glad to see the score kind of beat your expectations :D