Say Maasha’Allah TabaarakAllah or Allahumma baarik and not just Maasha’Allah as Maasha’Allah alone isn’t sufficient as the narration mentions to seek blessings for it.
What about Jazaak’Allah?
That just means, may Allah reward you. The correct way is to say Jazaak’Allah Khayran or Jazaak’Allah Khayra. It means, may Allah reward you with good.
What is Wa iyyak? It means, and to you.