NO THIS IS NOT REALLY A TUTORIAL,
I'VE JUST BEEN ASKED MANY-A-TIME. UWU~
✘ DO THAT SKETCH!
✘ Make the image about 1200 x 1000 pixels (make it big!)
✘ Zoom in until you are comfortable (I zoom in until about 300%)
✘ Then I use a 1px & 2px brush for the lines paying close attention to the strokes and details<3
DON'T DOWNSIZE THE IMAGE UNTIL THE END AFTER THIS POINT.<3
And it's as simple as that for Veekee line art.
Video tutorials will come after my recovery<3