You can n0w copy canvas and then insert the characters onto the background scene without the need to do any erasing.
Hope that helps.
I’m not sure why I started to draw a wintry scene featuring a St. Bernard in June…
However, if you’re interested in learning how to draw cartoon dogs, add your name, best email address, and type “Woof!” in the subject line, and I’ll send you details of the ‘Cartooning Canines - How To Draw Cartoon Dogs’ Course.