Usage patterns
素敵な〈人〉a wonderful, charming person
She's truly a wonderful person.
素敵な〈物〉a lovely thing (dress, gift, house, etc.)
That dress is really lovely.
〈物・人〉が素敵に見えるsomething/someone looks wonderful
That hairstyle looks great on you.
素敵ですねused as an exclamation to praise something admiringly
This view is wonderful, isn't it?