This is a reconstructed version of my BIRD BRAIN brush to fit the guidelines CSP has! It's changed quite a lot in texture and feel, but I hope it still holds up.
Original, uncompressed version of the brush thumbnail, made only with the brush provided.

Example image that shows the base brush size ( 25 px ) and a much bigger brush size, with an example of the brush on "Eraser" mode as well.
This time the original brush tip image was replaced with a real scribbled one that still resembles my bird, Yogurt, but isn't a edited PNG of him.

It has a more cleaner, stable lining pen texture rather than the streakiness the original brush had, but you can still get some texture out of it from making soft line movements.

Example image that shows the base brush size ( 25 px ) and a much bigger brush size, with an example of the brush on "Eraser" mode as well.
This time the original brush tip image was replaced with a real scribbled one that still resembles my bird, Yogurt, but isn't a edited PNG of him.

It has a more cleaner, stable lining pen texture rather than the streakiness the original brush had, but you can still get some texture out of it from making soft line movements.