Here's the third and last bunch of stuff from that sketchbook.
First up is a "wolverine mutant", clearly intended as part of the TMNT toy line -- probably as a bad guy.
Next is a very rough "rough" for an ad for the "Leonardo One Issue Micro-Series". I can't remember if this was meant to be a "house" ad, one we'd put in various Mirage comics, or something we'd use in publications like the Comics Buyer's Guide. In fact, I can't remember if this design ever made it to a finished piece.
This next one may be that same mutant wolverine character, slightly tweaked. I like his goggles.
This next one isn't a sketch, per se, but it is kind of interesting (well, I find it so, anyway). It's my chart of the proposed contents of the Gobbledygook special.
I get a kick out of this one, done just for fun, of Donatello whistling nervously as he is stalked by a big, creepy monster.
This next one might have been a rough sketch for a proposed TMNT portfolio piece, but I can't remember for sure. I'm not certain it is obvious enough in the sketch, but the Turtles here are -- for some reason -- on top of some gigantic beast, maybe Godzilla-sized, and that thing next to them is one of the creature's dorsal fins… and the little bug-like things on the left side of the drawing are parasites living on the creature.
And the last thing from the sketchbook is from that same project -- here I was trying to work out a design for the "Commandosaurs" logo. -- PL