Nice initiative making a real-time paint video like this as a tutorial, even if seems to me it could use some guidance on what technique you use, what tools, etc, for it to really teach the viewer how you do this. Also, doesn't always seem like the most efficient way of drawing, having everything on one layer like this, partly overlappy/underlapping solid colors and line-work, and outlines are pretty thick and wavery. That said, the end result isn't bad at all! Zoomed out you don't notice any of these deficiancies, it looks good; the sketchy style makes it all the more unique. Nice work!
-cd-