I sit at the easel.
Just a quick question for everyone - Do you sit or stand when you paint?
I do both. 
Sit..... I work on a desk easel
I stand. But now considering sitting due to sciatica.
Sit when I paint outside at my camping table, stand when inside in my mini-studio.
Sit, easier on the legs and back
I stand for large paintings and sit for small paintings. Not sure what the size cutoff is. Either way, I stand back from the painting many, many times.
I sit with my table easel. Even in high school I sat on a tall stool at a standing easel. I agree with Dracula size would make a difference for sure. And definitely good to step back often.
If I work with an easel (oils and acrylics) I always stand whereas with watercolors (I just stick the paper on a board there) I sit.
6 months later
I do both depending on which part of the painting I'm working on.
4 days later
When I'm painting a 9x12, I'll sit. I stand for 16x20 or larger.
13 days later
I always stand when I'm doing the Bob paintings. I get too antsy. I'm constantly stepping back to look at it.
For my original art, I just sit. Unless, I'm working on something huge.