The sculpt is still one of the best customs ever, but man...some of the paint jobs we've seen just ruin it. 3 out of those 8 look good to me, the rest...well, that's all I'll say.
I don't think I'll ever change my opinion on custom paint jobs unless sculptors can feasibly cast in higher-quality material. Kuato, Lalla and Elvis are the only ones thus far that have been able to capture the translucent skin look correctly. It's one of the hardest things to do unless you actually cast in flesh-toned material.
I think that's a bit harsh mate, more than 3 there look good, in fact i'd say they all look good and i'd be happy with any of them on my shelf.
Plus, some of these heads were cast in the translucent material, some weren't, so i'd have a guess and say those you mentioned were indeed heads cast in the translucent material. Maybe Ven's version as well.