great, magnificent

(じょうず) Skillfully done! Usually used to praise one’s friends’ efforts (at art, music, cooking, etc.)   $$$
うまい Is used in the exact same context as 上手, but the emphasis is slightly different. うまい emphasizes that the thing (art, food, song, etc.) was pleasant to experience, whereas 上手 emphasizes that it was skillfully done.
(すてき) Wonderful! Magnificent! This is usually used only by women, and it is used in reference to things made or done by a third party – you wouldn’t say your friend’s cooking was すてき, but you’d say a dress your friend wore was すてき.
(りっぱ) Splendid! Magnificent! Unlike other words of praise, 立派 has a connotation of something very high-class, refined, elegant.
らしい(すばらしい) The best! Usually used about art or theatrical performances.
(みごと) Amazing! Funny to see! That monkey can ride a bicycle! Those fireworks are amazing! Or (sarcastic):that 3-year-old fell down the stairs really well! Do it again!  You wouldn’t use this to compliment something your friend did (unless you’re being sarcastic).