I was never a believer of the under tone/shadow method until last year after speaking to a few painters and also following nakatans work.
It most definitely improves depth and is especially effective on skin / flesh.
The trick to white is not to use white! Lol
Great start mate, quick tip concentrate on just a small part of the mini, (eg a leg or arm) get it to near finished so you can tell if your happy with the colour scheme and also it helps with the paint mojo seeing the mini come to life in sections
