well digital has an open mouth, and has brighter colors (Well thats just because it was digital) and other than that it may of been another case of tracing or using reference pictures
early was the skinnier one transit was the pale one, and full on was the one we all know and love, from squid on strikeearly markerbob looks like season 1 except for digital coloring, trasnit markerbob is a blend between the protoype designs and season 3 markerbob.
Here are the three stages of markerbob:
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From left to right: early, transit, and full on
early was the skinnier one transit was the pale one, and full on was the one we all know and love, from squid on strike
late season 2 was like the transition to full onI don’t think there was a pivotal episode that begun each stage of markerbob, it gradually evolved. Squid on Strike looks different than Pranks a Lot does, and both of the episodes are full on.