This list is something I have used for many years while outdoor painting but I recently started using it in the studio as well.
To start with, try to finish within two hours (three hours maximum), before the light changes too drastically and you get too deeply invested in the piece and lose judgment. For indoors, it’s good to walk away after a couple of hours for a bit and come back with a fresh eye.
Throughout the course of the painting a little self-critique is a valuable exercise. My father always said; “When you dig yourself into a deep hole, take the time to inspect the quality of your work that got you there in the first place”. Worthy advice. Thus, during the course of the session, especially when close to finishing a painting, pause and ask yourself the following questions: