If you want to compliment someone on their achievements, you can say:
(Che) Bravo! Good job!
Bravissimo! Excellent job!
If you want to compliment somebody in the specific circumstances of a wedding or graduation or a promotion at work, you can easily say:
and you could add depending on the context:
Congratulazioni te lo sei meritato! Congratulations you deserved it!
Complimenti per il traguardo! Congratulations for the achievement!
If you want to make a physical appreciation, you can use the formula:
Che + adjective + noun
Che bravo studente! Good student!
Che begli occhi! What a nice eyes!
Che bel bambino! What a beautiful kid!
If you want to make any kind appreciation, you can use the formula:
Come + verb
Come sei bella oggi! How beautiful you are today!
Come sei stato bravo oggi! How good you were today!
Come parli bene italiano! You speak Italian really well!
Come guidi bene! You drive really well!
If you want to compliment someone for their appearance or looking in a good shape:
Stai proprio bene! You look great!
Sei in forma! You are in good shape!
Ti vedo in grandissima forma! You are in great shape!
If you want to make an appreciation of somebody’s look or style:
Il vestito ti sta benissimo! The dress fits you very well!
Questo taglio di capelli ti sta da Dio! This new haircut suits you very very well!
Ti sta bene questa gonna! This skirt suits you!
Serena is a proud polyglot, teacher and language expert. After learning 8+ foreign languages and working long hours a job she was not born for, she decided she urged a significant life change. She is now combining what she loves doing with what she is good at, helping people to learn Italian online. She has been sharing her love for Italy and the Bella Lingua across the world for the last four years. Her goal is helping enthusiastic humans to transform Italian Language Learning into a habit in their lives.