This was a particularly hard photo to clean, because of all the fingerprints and dirt on the original. In order to keep to the original as much as possible which I am sure was a reasonably clean photo, it was inevitable that some characteristics would be removed..
It has been stated that you can 'say' many hundreds of words just with a slight change of expression in your face. This is one reason I would never use a facial recognition programme when doing restoration, as some do, because it cleans a face of expression and all the eyes are too perfect.
We do our best, as we see it, I always try to keep as much to the original as possible. As Handypandy says it is the diversity of styles which makes this site so interesting..