Very well done! "White is a pain in the ass to paint," above, as the original poster put it--my instinct is to always go for lighter grey and then a white drybrush.
"Sticky note pulls the basing material right off." The advisor of my old university club devised a notation using a series of dots--this works best with some bases that have some thickness, like wargame bases, or the round slotta-bases that have some height, but you could put a colored dot or two on even a rpg miniature base and then paint or flock the rest. (And sticky note went on the bottom of the base, anyway.)