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It's on page 94 just above his 3D model. There are other sketches that may show his mouth without them, but it's difficult to tell if it's actually his mouth or part of the mask.
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Ah, I see. It's a rejected production design, so I wouldn't take it as canon. It's possible that Lorne hadn't fully worked out either Bigface or Abe's backstories. Or possibly the designer was so used to drawing Abe with stitchlips that he unthinkingly did the same to Bigface.