Continuing with my exploration, I played with Ernie, Elmo, and Oscar. I think a forehead "detail" helps a lot in this style.
I had to give Ernie a angle on his forehead. Not so pleased.
Elmo's eyes kind of worked, but not really.
Oscar was my favorite of this week. He worked the best. I spent two sessions of my 30s on him. I liked it. I think I'll do it more.