Just a square brush I like to use for lineart and stuff
You can retweet/share the brush here: https://twitter.com/funnybnuuy/status/1556122013848244224?s=20&t=m1gZs_QqqqosMc_BOF82hA
Here's what the brush strokes look like:
![](http://assets.clip-studio.com/en-us/description/1940556/img/e7555cd261-b349-4c8b-0d1e-d0d1dabf4b.png)
Here's a complete piece using just the brush (I did fiddle with the opacity a bit!):
![](http://assets.clip-studio.com/en-us/description/1940556/img/416982b475-2c45-e093-ad85-c1114dd961.png)