For 30 consecutive days during 11/2017-12/2017 I took pictures on my phone of my seven cats (or used photos of friends' cats) and drew one per day, using a 9-in x 12-in sketchpad and a black sharpie while looking at my phone. Then I posted the photo + drawing together on Instagram (@motherofcoonhounds) with the hashtags #30dayfminimalistcatdrawingchallenge, #minimalistcatdrawingchallenge, #30daysofminimalistcatdrawings, and #minimalistcatdrawing.
There were no do-overs - I just shared the first and only drawing I did on each day.