The look I’m going for here is somewhere between a movie teaser poster and a jazz album cover from the late 60s and 70s. I decided to go with an opaque paint to get that rich silk screened look. Holbein makes a product called acrya gouache that's perfect for this application. It's very opaque and the colors dry to a nice matte finish, and it has a pretty impressive color range. It's a bit like animation cell paint, but it's a little easier to get your hands on. I thinned the colors down to a milky consistency to give it a slight bit of texture. Going to flat and opaque here would make things look a little too artificial and cut out, but that texture will tie the background and foreground together.