Regarding your email. It seems like a big part of your problem is that you are painting in the black background with is muddying up everything. The example you wanted to learn is really just painting in the foreground. On a white background as well.
You can use the controls in the path start control panel to inhibit path starts. So, you could try inhibiting super low luminance values (which would be dark) from having path starts. However, you also have dark detail in your foregound image, so that might not work as well for your particular source.
You could select the background, then invert the selection so you get the foreground image selected. Then use the path start inhibit controls so that only selected areas of the canvas have path starts.
Or, you could turn on masking, and then mask the path. That way you get complete paint nibs drawn.
Here's a tip on masking and selection. Read about the paint masking options in the tip to understand what i was referring to (path vs paint mask).
If you still run into problems, try posting your question as a forum post and i'll try to answer there. helps if you attach the paint preset you are working with there.
Image sequences built with images pulled from the Aria and Variations videos (up to Var 17).
More info here: https://vimeo.com/showcase/5641128
At first, the 32 videos will be posted on Vimeo, one at a time (Aria + 30 Variations + Aria da Capo)…
"Thanks...I have applled to Adobe for a grant with that in mind... They have a Creative Residency Program offering $500 to $5000 if accepted. When I have enough courage I also want to see figure out how to animate these with transitions between the…"