Thanks so much Enzie and Grethe, this Forum has been a life saver for me and so many others. I have to add that I have had better response this time than ever before here on the Forum and for that I am so grateful.
I will take all into consideration when I proceed. At the moment I have suffered set back with an injured shoulder ( muscle or or tissue damage) , nothing severe but have to take it real easy. Standing or sitting is painful. So I shall return to my painting soon I am sure.
Grethe, I would like to promise you that but I know me. I sometimes think that I can just do anything. I want so much to be so good that I can study and convert any problem areas in a photo.

I guess I had better reconsider, huh?
Enzie, I think those would help, not that I know how to use them but common sense tells me how to figure it out. What is the difference in the dividers you show here and the other ones ( $18.99) on the site you sent me? It says Ultralight Divider / Compass.
Thanks again and I shall return
Patt