These are the sketches I used in the latest Yōikoma ( http://omaketheater.com/yoikoma/yonkoma-139/ )
My sketch panels are all blank except for the first one. That's because almost all of the work was reused from Yōikoma #58 ( https://omaketheater.com/yoikoma/yonkoma-58/ ) and any changes were done without sketches in Clip Studio Paint.