Classic pose with good sharpness Marc! Angle of light is less than ideal and some of the whites look a little hot on my monitor. Wish your wife a happy birthday!
I agree about the light angle - some fill flash would have helped with the shadows here and helped put "life" into the eye. There is a dark halo along the back of the neck (perhaps as result of post-processing). Outdoors is a good way to spend any birthday! :-)
Nice composition and sharpness. The dark halo at the neck will be easy to remove in PS. Do wish for a better light angle though. Happy Birthday to your wife!