for the final daw of my series, i created a tool that imports both the vector data of a line drawing (tracing that i made) and the RGB values of the original image. It then draws the tracing and uses the RGB values to adjust the width of the stroke.

In the second and third examples i also used the color data from the original picture to adjust the line color as well. All of this is pretty lo-fi, i'm only using values from a 200x200 image, and only taking a point sample (rather than averaging the value across the entire length of the line).

I'm pretty happy with the third drawing, at least in the sense that it has a bit more pencil-like quality to it.

here is a link to the file that created it.

i ghosted the original image behind it so you have some frame of reference.