Several things I like about this shot.
It is a simple spontaneous "snapshot".

My 13 y/o daughter and 10 y/o nephew had a great time on vacation.

This is with an old Nikkor 105mm f/2.5 which seems to be a highly thought of classic design portrait lens.
I've barely used it but it does something special with saturation and contrast.
The astute among you will notice I missed the focus a bit.
Wide open it's focus is just in front of her eyes but I like the soft focus "bokeh".
Somethings special lens for $120 cheap. I need to get out and use it!

D2X 1/30th f/2.5 Nikkor 105.2.5-IA, pre-AIS