I do both for the same reasons as mentioned before.
I do like to ask: "When standing, at what degree of tilt, do you keep your easel at?
When I stand my back just kills me after some time, because I seem to be leaning away from the easel, even though the easel is tilted away from me as well. The position of me and the easel is like a "V" , if I tilt the easel towards me matters get even worse. So now I am starting to wonder if maybe my eyesight is going bad. So please help an aging artist with your input.
