seems to me if you are out just blowing $$ on a 70-200 2.8 you should have some idea on what your doing.. IHF is right on it.. Your WB is off. The boy in the background shouldn’t be there..
The only thing I could see doing there with something like that if posed is to tripod the camera frame the shot then make the boy take steps backwards like he’s falling out of focus.. that’s just me .. but you ask for opinion and then you seem to get defensive ?
They make these nifty little contraptions you snap to the end of your lens and take a balanced exposure and set your white balance off of the resulting image.. works pretty well, you should get one