DESCRIPTION
Here's a 44 minute video, and a 1hr video where I wrestle with pixels, painting over some 16 colour PC Engine sprites (from spriters-resource).
Probably best to watch at 2x, keep in the background or skip around.
Part 2:
https://www.youtube.com/watch?v=W_LNkjwIe0M
Program: Photoshop, using a 1-pixel brush. More info in video comment.