Yep, airbrush produces great results for OSLs quite easily since you can spray very translucent layers that blend in automatically and look really smooth. If you have an airbrush give it a try.
Really like the face. Blends look really smooth even on those large pictures. When I look at the neatly painted Eyes and teeth highlights, your hands and eyes can't be that bad xD
On the eye topic -> using x2.5 magnifying glasses since I got 27 -.-
Before that I used to joke with/about the "old men" that were using those when we met at painting conventions. First realized it myself when I was painting faces and somehow couldn't paint eyes anymore. Vision got blurry. So joke was on me when I got to our meeting in the following year unpacking and waering my own magnifying glasses xD
At first it is a bit unfamiliar but you're getting used to them quite quickly. I prefer glasses over the visors though.
I use these
https://www.optik-pro.de/Produktbilder/zoom/60222_2/Eschenbach-Lupenbrille-laboMED-2-5X-bino.jpg -> you can find them on the big online action house for around 10-20$