I used my 50mm prime lens on these two, which is what I use for portraits in general. I shot at an aperture of f/1.8 because they are so small and a shutter speed of 1/160 seconds hoping that was fast enough to keep any blur out if they moved a bit.
The ISO was at 800 which is fairly high even though I was indoors, but I really wanted to balance the ambient light with the flash so I pushed it up some.
I always get excited when I am able to use my new flash with success, since I am mostly inexperienced with flash.
Sony A68/ Godox V1-S/ Capture One
Offshoots Photography 
Your comments are appreciated