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hah my style is just an outline with some of the less important lines or lost edges left out. 60 second speed drawings of faces mostly. my secret is to have done thousands of them. i bet you could do them as good or better than i can with only a single sketchbook of practice.

i used to do much more rendering, i especially liked how the light/shadow line defines shape and texture. with my current style i almost never do any shading anymore. i am trying to learn watercolor so i will get back into it soon.

i only started using pen because i felt i was erasing too much and i watched a couple kim jung gi videos and got super jealous.

his most recent submission to youtube

If you could find a good pen that won't bleed in water, adding some select watercolours to your sketches would be pretty great. Maybe even a bleeding ink could make some nice effects in some areas.
Its a great technique you've developed, its very difficult to stand out with a unique styling and it only comes from whittling away it. Its a good example of refinement, has that Japanese aesthetic.
I'll have to keep watching and try some pen work - i like the sound of getting a good result in 60 seconds!