I recently came across a mosaic on eBay that I thought was a knock-off of a painting by Arthur Gladfelter, but after further research I discovered I was mistaken. They both are in fact copies of Picasso's Pierrot and Harlequin (c. 1920). I also learned that many other artists including, Gris and Cézanne created works based on the Pierrot and Harlequin characters. For more info on Pierrot and Harlequin check here and here.
Picasso, Pierrot and Harlequin, Standing, c. 1920, stencil print, 10.8" x 8.4". via MOMA
Arthur Gladfelter, The Traveling Actors, 1963, oil on canvas, 20" x 16". E & L Alexandria
signed Beard, untitled, "shell" shards mosaic panel, 46.5" x 34.5". eBay $1,400 at time of post