How do you get from photo to canvas?

[Brenda Ellis]

Thank you, Richard and Sharon.
I think I will look for a transparent ruler; that sounds like a good idea..much better than a pencil or brush handle.
I will have to be more assertive about getting the model back in the proper position. I often feel like I'd be nitpicking if I tried to get her/his head back in the exact position. But I will be a little more assertive. Usually the other artists do whole body paintings or drawings and I'm the only one who tends to focus on just the head or head and torso, so i guess that makes me the "pose monitor" if I want the head to be in the same position!
Thank you both for the good advice and wise words. Measure measure measure. And simplify those baroque, intestinally twisted folds of fabric!