These are just incredibly basic, and oft repeated, pixel art 101 guidelines. And, quite frankly, some of those tips are what I consider bad advice (e. g. a pixel artist has to deal with color theory as much as a character artist or animator has to deal with anatomy; a good understanding of color theory is also necessary to nurture good taste in the first place... so the quicker one gets into that, the better).

Also, just like in coding: Constraints don't hide your flaws (per se); you fuck up, people will (let you) know. And pieces in constrained environments can be much, much harder to pull off.

I had hoped for something closer to the intersection of pixel art and graphics programming. Well, maybe in the future.