I'm looking at purchasing my first easel (or making one, but I need the same information for both options...) and I don't know what I should be looking for.
How tall should it be?
I expect that this varies based on whether I'm in a standing or sitting position when I use it. What are the advantages and disadvantages of working from a standing position?
Where should the work surface be relative to my shoulders/eyes? Does the recommended viewing angle of my canvas vary based on the position of the model, when I'm using a model?
Is a stool a requirement if I'm working primarily from a standing position?
Any other ergonomics suggestions are also welcome. A quick search didn't bring up any general ergonomics of art threads, and I'm curious.