Also, can you add a grid texture with circles and a per-pixel grid? Maybe the one here with the big R... http://wiki.polycount.net/TextureCoordinates#UV_Map_Grids
search for pixel art tutorials. The hand painted tutorial torch referenced is good too - the same fundamentals apply you're just working at a smaller resolution.
it's a really fun program. Somehow it reminds me of doing pixel art on my Amiga. Is the Marmoset version any different from the previously offered one?
There is a step I am missing. It looks like they are painting on a mask or something, not sure because when i paint on the plane , the pixels dont bevel in or out.