As of today, Isabel Marks has drawn:
2691Namir Deiter
1761You Say it First
556Spare Parts
260Unlike Minerva
64The Shokora Diaries
67Undoubtedly Kawaii
77Dealing With It
132Grover Hills
382Other bonus comics
468Bonus books
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6458Regular comics
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1259Bonus sketches
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7717Total comics
And that's not counting wallpapers, gift art, and couple other things we probably overlooked.