Critique First portrait with 70-200 f/2.8L II

[Twigman]

IMG_7308 by Ian Gibson, on Flickr

My youngest son - on his holidays.....this is my first play with the 70-200 f/2.8L IS II USM using 80D body - pic straight from camera - no processing no cropping

He had just got off the water slide and was walking towards me when I took this - he wasn't expecting me to be shooting him - he was several metres away