Of course it is! Cuteness is not about height, it's about your face, behavior, style, gestures etc. It's about the way you dress, talk, radiate... I know some totally adorable, sweet tall girls. And being tall is a plus because you have the cuteness AND the long legs to make you stunning.
Definitely. Cuteness is much more in the person than it is in a mere parameter like height. Shorter girls typically have a better chance of being "cute" the same way a kid is; though, that is usually due to insecurity on the male's part. For me, I'd love a girl who can look at me dead in the eyes without me having to look down at her. And, basically, cuteness is just another term for "perceived sweetness". Which is a state of mind, and one that most girls have in spades. :)