Charles H. Twelvetrees is well-known to vintage postcard, and ephemera collectors in general for his many illustrations, mainly of chubby-cheeked children, which often are shown with funny captions. I put up the two examples that I have from postcards below (cropped and cleaned up a little in Photoshop.)

His work can also be found on magazine covers, in newspapers, on calendars, and as valentines of that era. To mention a couple of particular examples, he was the illustrator for a children’s story by Seymour Eaton, called Prince Domino and ‘Muffles,’ and he did a comic strip called Johnny Quack and the Van Cluck Twins. (Some accounts say Van Cluck Sisters which, unless the strip name was changed at some point, is...