I made a rough pencil sketch on the acrylic paper, but when I got into the process of painting, I got carried away and things ended a bit different than how I planned them to be.
I used three colours: white, primary blue and phtalo green. White is not only needed to lighten up the blue and green, but also to make those two colours opaque. I bought a set of ten plastic knifes (not palette knifes but the real ones which you use for BBQ outside), using them for mixing colours. I’ve seen some video tutorials where the palettes are very, very well organized – I’m afraid I’ve got to learn a lot here. However I’m very much satisfied with my paper palettes (originally being designed as quadrangular BBY paper plates). They are very good for mixing colours and are easily decluttered when they are full of dried up paint.