Add the ‘squiggles’ to add pattern and texture to the colour. I reused the same 6 shapes from earlier, coloured, scaled, rotated, and changed their transparency. There is no real need to create too many different shapes.
I added white tapered lines for some highlights in the hair, around the mouth, and on the horns. Ideally, you want to create these areas as holes in the shapes to retain the transparency of the colouring. Let’s consider them ‘white gouache’ added on top for now. 🙂