Paint the sides first!

  When I started painting like this after one week of blank period due to my day job, I realized I hadn't painted the sides of the canvas. Especially for the painting like this, which would have lighter colors, painting the sides has to happen first. I stopped painting and painted both sides, left and right, with dark color. I need to wait until it dries up and rotate the canvas 90 degrees then paint top & bottom sides.