I love it! I love nice, casual and relaxed portraits like this. I am so glad you did not make the amateur mistake of placing her head right in the middle of the frame. The rule of thirds works very well for portaits. You should always try to put their eyes along the top horizontal third, which you did here. You can see some reflections in her eyes, which is good too. If there are no reflections in the eyes, then a portrait like this looks dull.
I would make a few suggestions, but since a picture is worth a thousand words, I will just let you see what I would have tweaked a little to improve on it! Even though it was sunny, she was in shade and I probably would have used a very light (15%) fill flash on her to lighten her up and add some sparkle to the eyes. Below is a real "quick and dirty" tweak, and granted a few are personal preferences like I like to vignette the lower corners of the portrait to help draw you eyes to the lighter areas, but again that is purely a
Scott thing, not by any stretch a have-to thing!