Wow, nice. As said, it doesn't look too much like link ..in the sense that as you increase the size of the ALttP sprite, it looks a bit less like the character of Link.
Nevertheless, good work. I don't have many crits, as it's obvious that you were basing this off of the original. While it may have slight flaws, those were inherent in upgrading the original.
Despite all of that, the right side of the hair looks a slight bit ..too much higher than the left(and the hair could have more detail...)
. Or vice-versa, if you were link >__>.
(edit: and the tunic is a bit bright)