I'm a big fan of how cartoony the art of Morishima Akiko and Mikune Hajime are, and by the same token the art of doujin artists like nwonyo pasun. and Akinbo, although the latter's stories are a bit odd. The expressiveness of the art is what really sells those artists.
Although not cartoony, per se, that expressiveness carries over into the works of Kazuma Kowo, Ratana Satis, and Matsushita Mai. There's a sense of freedom in the work of artists like that which I find appealing.
On the other side, I love the stateliness and formality of artists like Personal Color, Yamaji Ebine and Nakatani Nio, both of which are perfect fits with the more introspective subject matter they tend to write about.