I love the great treatment of the trees and the light filtering through them in the back. The white tree is a little jarring in contrast, I would definitely use a light grey tone instead of the sharp white. This is an interesting painting actually. All the tones are really cool. Although it's subtle, the warmest tone is the light coming thru the trees. It draws the eye all the way through to the back, you hardly even notice there are characters here.
Rita did not choose an easy photo to start with, but I think she had lots of success. She did a great job on the skin. Skin tones can be very tricky, especially when working from a photograph. Photos tend to make the skin look smooth and often does not provide much in the way of contrast. Check out those bright yellow highlights for the blonde. So awesome.