Beautiful bird, in Portuguese, would be "pássaro lindo". Simply put, "pássaro" is bird and "lindo" means beautiful (in the masculine gender tough, for the feminine correspondent one would use "linda", which still means beautiful, but only applies to the female gender.).
You can say "isso é bonito" in Portuguese to mean "that is beautiful."
beautiful
you are stunning
Lindo\linda.
In Brazilian portuguese, girls and women say : "Olá lindão" (leendawn)
You could say "Você é linda" in Portuguese, which means "You are beautiful."
pássaro, passarinho, ave.
Pássaro brincalhão
Boa noite, linda (for female beautiful)
You can say "Que bela imagem" in Portuguese to express that a picture is nice or beautiful.
Belo dançarino.
vida bela