My thanks to Tielmanc for his step-by-step tutorial Animate Your Existing Characters | Keyframes Tutorial, which popped up in a Clip Studio Paint e-mail yesterday. He makes the point that you don’t need to redraw a character to animate it, just carefully break up your drawing into component parts and fill in the missing areas.
His example was a farmer dog, so I’ve gone for this cartoon I drew of the fox that visits our garden.
Now that I’m not completely foxed about the principles involved, I can go on to something more ambitious.
Link
Animate Your Existing Characters | Keyframes Tutorial