cheers B & dog
as for the skin, this is the colours used...
skin painting:
basecoat: ... fortress grey GW fondation colour
highlight: vallejo london grey, vallejo stone grey. white.
shading: vallejo black red, GW purple, GW scab red, GW scaly green (for darkest parts). black.
for skin variations: GW scab red, vallejo mahogny, GW scorched brown, GW burbonic brown. vallejo grey-green. some other colours i dont even remember lol
glazes used: onehundredmillions. something like that. everything except basecolour and edge highlight is painted using glazes.