This is the 3128th most frequent Russian word.
красиво
Beautifully.
The word 'красиво' is used as an adverb to describe the manner in which the action (painting) is performed.
Она красиво нарисовала картину.
She painted a picture beautifully.
'Красиво' expresses admiration for the surrounding scenery, functioning as a predicate.
Как красиво вокруг!
How beautiful it is around here!
Here, 'красивое'—the related adjective form—is used to describe 'выступление' (performance), showing a derivation of the base word.