Yay, yes, When You Say Nothing At All is perfectly matched!!! Well, this song has 2 versions. Male voice is sung by Ronan Keating, and Female voice is sung by Alisson Krauss. So this song can be interpreted by Zoro's POV or Robin's POV^^.
The smile on your face lets me know that you need me--------> Ough, Robin's smile was full of meaning XD
There's a truth in your eyes sayin' you'll never leave me----------> Gyaaa, they stare each others
The touch of your hand says you'll catch me if ever I fall-------> Zoro catched Robin in Skypiea and when Robin cathced Zoro that he is thrown by Oz
You say it best when you say nothing at all------> Aaargh, it's so Zorobin's typical
Well. how about this song? "The Way You Look at Me" by Christian Bautista:
No one ever saw me like you do
All the things that I could add up too
I never knew just what a smile was worth
But your eyes see everything without a single word
'Cause there's somethin' in the way you look at me
It's as if my heart knows you're the missing piece
You make me believe that there's nothing in this world I can't be
I never know what you see
But there's somethin' in the way you look at me
If I could freeze a moment in my mind
It'll be the second that you touch your lips to mine
I'd like to stop the clock, make time stands still
'Cause, baby, this is just the way I always wanna feel
'Cause there's somethin' in the way you look at me
It's as if my heart knows you're the missing piece
You make me believe that there's nothing in this world I can't be
I never know what you see
But there's somethin' in the way you look at me
I don't know how or why I feel different in your eyes
All I know is it happens every time
'Cause there's somethin' in the way you look at me
It's as if my heart knows you're the missing piece
You make me believe that there's nothing in this world I can't be
I never know what you see
But there's somethin' in the way you look at me
The way you look at me