Grail,
Thanks for submitting these revisions. I love the cartoony-ness of the lab, but the eyes are a little creepy -- What is she looking at? ;) Also, I like the handkerchief, but I think the tongue runs into it. Maybe a different color, or if that doesn't work remove it (the tongue is really cute, I wouldn't want to take away from that).
The font, the two-tone colors, and the white dots for "Maggie Labs" are a little distracting, perhaps a solid color or a different font?
I think you've got all the elements, just a matter of layout.
#19 is very linear and very busy (beaker, then dog, then text, with tag under). #17 is better but the table might be a little much. Did you consider the beaker between "Maggie" and "Labs", with the dog either under the text or above?
All-in-all, these are really nice (and really, pretty close). Thanks so much for your effort.
-John