Hi Juny, I think the font in #16 and #19 is an improvement, and better than the font in #17 and #18 (where I think the letters are too round/wide vs. their height, making them seem too "cutesy"), and both fonts are better than the font in #12 in terms of looking more handwritten. While I like that the font in #16 and #19 is more businesslike, I'd like to see the letters connect together better, so that the letters seem to flow together as they would if someone had actually written them by hand.
The sticky notes in #19 are interesting, although I think I still prefer the ones in the other designs, where the sticky notes have a thin, dark border (provides better contrast against a white background, makes the edges easier to see). It would still be great to incorporate some sense of motion into the logo somewhere, if possible.
Thanks!