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Mike Marcantel
Homer watching "Dinosaurs" in 'Black widower'

Homer commenting on Bart's new bong, 'Homer's barbershop quartet'.

Marcantel draws Homer with a curvy head; he makes it tall and thin, and draws pinched facial features at the lower front of the head, emphasizing the forehead size. He also draws a smaller muzzel. After his first few seasons on the show, when he stopped working for Jeff Lynch, Mike Marcantel stopped drawing the curvy head altogether.

Chris Loudon
Homer acting suggestivley infront of Bart, in 'Black widower'

Homer confesses his wacky scheme to the hospitalized dean, 'Homer goes to college'

Chris Loudon draws homer with the simmilar curvy forms, but he draws the top of Homer's head wider and roudner than the rest of it. In contrast to Mike Marcantel, Chris keeps the facial features in a more central position, and the forehead isn't tall.

Yeah, I was wrong, Mike Marcantel did the "Dinosaurs" parody in 'Black Widower', not Mark Colangelo. What really threw me off was the M-hairs on Homer. Colangelo tended to draw them as incomplete zigzags, and Marcantel did not, excluding the scene in question.