Try and draw a pattern that fits together, so regular shapes interlock. It’s easy with squares or diamonds, triangles or even hexagons, but when you get onto irregular shapes it’s more difficult. Interlocking shapes made up of the same shape over and over are called tessellations I think. Although I’m not sure because tessera are the little squares or oblongs they use in mosaics I think? I really need to look these things up before I write them down!
Anyway I’m working towards drawing dragons, and they are usually covered in scales, like snakes. That led me to realise that ideally I would like an interlocking pattern. I could look at a snake, or a fish, or a lizard, but I just made my own up. I added some crosshatching for shade and patterns for interest. I hope people aren’t getting bored with my experiments!