Lovely portrait---I think it could have been made a little sharper with your PC. What post processing tools do you use. In portraits its usually also good to gave an extra level of sharpness to to the eyes.
Not sure whether it's only me.. but i try to practise this for a close up potrait.. if it's not sharp.. make it more blur with noise. But when it comes to customers.. most of them won't appreciate that.. he he.