Two weeks ago I decided to brave the snow and cold and go out plein air painting. I painted for one hour. The little "study" turned out well, even with only one hour at work. I used the study and a photo as reference and painted this studio painting.
I have read numerous discussions on the value of plein air painting. Robert Genn recently wrote about the subject and describes painting outside as "inhaling the environment". Here is a link to his article: http://clicks.robertgenn.com/frequent-pause-system.php