Courtesy Kevin Scalzo: 

By Miss Lasko-Gross, Ted Stearn, Leah Hayes, Dash Shaw, Sam Henderson, Jason, Lynda Barry, Michael Kupperman, and Alex Cox. (Click the thumbnails for larger versions.) Fantastic, one and all. I'll get you next time, Mr. Panter.

Courtesy Lewis Trondheim. Watching Trondheim draw this freehand, in just a couple of minutes, was kind of incredible: 

Courtesy Roberta Gregory: 

Courtesy Mary Fleener:

Courtesy Ben Katchor: 

This is the only sketch in my book that I paid for, and I would have paid four times as much. From the great Kelly Freas: 

Courtesy the man so good, he should be named Tony Billionaire:

Courtesy R.C. Harvey:

Courtesy Sam Henderson: