I do make custom brushes. They're mostly for detail and texture. I have some "sponge" type brushes that I use for rocks and to get the kind of "grainy" look in some areas. I find the best brushes are kind of simple, but then you can gain complexity by adjusting the behavior in the brushes panel - to jitter the size, angle, etc. When I get some settings I like, then I save the brush.I learned to paint using acrylic and gouache, so I tried to make some brushes that give me a similar feeling to that. They more or less look like a line of dotsBut when the spacing is very small (like 1%) and the size is set to tablet input - it is quite a bit like using a regular square brush with traditional paint