Hi Steve , I think I would tackle these in acrylics , stay with bright colours and stay with one shadow colour and one highlight colour per colour . What I'm trying to say don't have to many transitions colours for each colour , keep it simple and clean .
chippy

Cheers Chippy already pretty decided acrylics for these bad boys yeah but thanks for confirming it
Steve

Many thanks Boots
Steve

I'd go with block colour's and over emphasised shadow.

Cheers Ralph yup think that's the way to go
Steve