Check these out by Steve Cunningham.. Steve is a master of the thumbnail quick sketch.. He pretimes his cg animation to the frame.. Steve was a 2D animator back in the day of Don Bluth and had to learn timing like we all did.. by instinct.. .. We didnt have playblasts every two minutes to test the timing.. Clear and concise.. Click here for more..
https://www.artstation.com/artwork/OAK2K