Welcome to Librarium Online!
The paint-scheme looks great. Good white is always hard to get correct, but you've managed fine. Also I have to say I like the white SG more than the "classic" gold ones. I guess white is just so rarely seen in marines and the contrast with units of other colors is so striking. One question, though, did you cut down their weapons?
Revenant Moon Necrons: (W/L/D) 0/1/0 (6th edition: 13/2/2)(5th edition: 14/6/4)(3rd edition Codex: 16/4/7)
XIX Legion: (W/L/D) 0/0/0 (5th edition: 14/12/2)(5th edition Codex: 4/3/0)
Black Legion: (W/L/D) 1/0/0 (6th edition: 2/3/0)
Something Wicked... Reikwald Beastmen: (W/L/D) 10/4/1
They look ace, I agree with Polaria in that I prefer your White to the GW Gold versions, something really eerie and ghostly about them, excellent work!