Tutorials on basic art techniques might actually be a really good niche to get into. I bet a lot of people would be interested. You could start from the ground up with the absolute basics, then gradually build on that until you reach a completed drawing.
By the way the knight is my favorite. I'd like to see you do some non-humanoid characters, maybe some monsters out of Greek mythology or something.
I have already done a few posts in the past on art tutorials though they are a little advance. Perhaps a tutorial video on painting in grey scale with primitive shapes would be a good place to start.