If you've ever tried to paint on an oval canvas, you know that it can be a challenge to keep it still while painting. The irregular shape causes it to move like a cam in an automobile or roll like a football or an egg until it rests on its longer side. Here I've illustrated some simple steps to making a fixture that mounts to an easel so that the canvas can rest stationary and vertically, especially if painting a portrait. This fixture is for a 16"x 20" pre-stretched oval canvas. I just used some scrap 1"x 4" lumber (which actually measures 3/4"x 3 1/2"), some wood glue, and some screws.
I have often found that necessity is the mother of invention. Perhaps you have found the same to be true, and have come up with some creative solutions of your own. Feel free to share your thoughts or questions in the comment section below.