Here is a comparison between 2 versions of the same image. The first is digitally enhanced with a "find edges" filter, which has the effect of emphasizing the structure of the drawing & removing tonal variations...the second image is the original drawing. I think I vastly prefer the digital version...I tend to avoid processing my own art, but in this case I think it works...
Ink (sharpie fine-line marker) version, diamter 7" approx.
Final version in blue with acrylic.