if you plan on painting white, be prepared to put in some serious time. There isnt really a quick way to do it. Obviously, if ya wanna paint a model white, it can be done, and can look lovely, but you basically have to paint every single bit individually, carefully, and completely. Other colours are a lot more forgiving. Even changing to a grey makes life much easier. (This is basically because if you make a mistake painting white, it ends up a blotchy grey. So, just skip the hassle and paint it grey right from the get-go)
I'd reccomend:
spray undercoat with grey, and try not to get a blue-grey.
Base coat: astronomicon grey (or fortress grey - much the same)
highlight with: astronomican grey+white-->white
shade with: either adgrey + a wee bit charadon granite, or just use devlan mud. (not all over. Just in the recesses. You could add a smidge of black for really deep shadows.)
Youll end up with a very, very light grey, and a slightly brown tinted shadow. pure grey/black shadows are boring and your mini will look flat.
However, what I can say, from experience, is that hawk turquoise will be fine for your trim. Paint it Hawk T, then wash it with a mix of blue and green inks (and thats inks, not the citadel washes. Get some vallejo inks and use those. The citadel washes are great, just not for this job.)
*edit* just watched the tutorial you posted and aye, if you do that you'll get nice results. As with the paints i mentioned above, its not really white, more of a pale grey. I stand by my earlier comment though, that if you paint it that way itll take feckin ages (hah! comments about speed painting coming from
moi!)
