Brush strokes should follow the edge tangent field provided by @gtoal in the parent project. I've extracted the ETF data into lists and you're free to use them. You'll need to press play or run the INITIALIZE block to populate the x, y, and magnitude lists. I used scratch to convert the ETF picture into lists, so I don't have 100% fidelity... but I think it may be good enough?
Edge Tangent Field data by @gtoal