These two design sketches were done by me before Kevin and I started working on issue #2 of the original Teenage Mutant Ninja Turtles comics, so that would have been sometime in summer or fall of 1984. Apparently, at the time these sketches were done, two important things had not yet been decided upon -- Baxter Stockman's race, and April O'Neil's name.
As you can see in this piece, I was going for a real "nerd" look for Stockman, whichever color he ended up being. April is just labeled "assistant" at this point. And from the drawing in the lower left of this piece, I guess I was still trying to work out how the Mousers would move when attacking.
This other piece is from a short time later, I suspect -- the looks of both characters are closer to the way they would finally appear in the second issue. I find it interesting that I labeled their footwear... don't ask me why I thought it was important to do so! -- PL