Apparently there's a difference...when you smile only with your lips, it can come across as fake! When you smile with your eyes, the other person finds it genuine...u twinkle! lol Try it next time with a stranger! Another case for our eyes being magical...=)
Most Helpful Guy
I don't think we have conscious control over HOW we smile.
If it's genuine - the eyes are involved (according to both your source and what I've read in the past).
If it's not a genuine smile I think it's hard to involve the eyes willingly.
You might be able to con a smile with the eyes but as humans, our intuition is pretty good ;).
Also - I believe when we talk about smiling eyes, it's referring to the creases on the outside of the eyes, not the eyes themselves (although they have their own charm too!).1