Hi Lee, thanks a lot. I didn't even noticed Pixel Persona before.
After I set up the Pixel Persona brush. I could not find a way to apply it on a vector curve. Does it work that way? I'm not very skilled to draw nice curves by hand.
I managed to made the effect with code in Processing (attached image). But to further customise the effect, it will take a lot more time to code and my code is not so optimised to run preview in real time.
Thanks.