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Yet Another PMD Comic has excellent expression work. You can crop a good reaction image from like every other page.
Milos From Home is a ancient one that's still going with really good characterization. The art has changed a lot over time and landed on a nice, slightly rough style. Probably my favorite ongoing comic.
Blue Rescue Team is a Korean comic that was only translated up to like chapter 21 of 99. The art was incredible and it still bums me out knowing I'll never get to read the rest of it.