when I worked as an illustrator, I never used brushes, and now I don’t understand how your trees do what they do, how did you achieve this if it’s not a secret?
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it's not a secret lol. You should try out blender's grease pencil and add the noise filter to it and set its strength according to your liking. Then make an animation of the noise and export each frame individually.
There are a lot of tutorial on this topic on youtube as well. I'll recommend this one: