You say, belle cousine.
Reste belle is how you say stay beautiful in French. You can also say: "garde ta beauté, garde ta fraîcheur which also means stay beautiful.
belle âme
"belle maison"
beau desastre
La maison de mes rêves
"Ma belle maison sur le lac"
Beautiful skin in French is "Belle Peau" :)
Belle famille is beautiful family in French.
"Belle femme" is "beautiful woman" in French.
Belles personnes is "beautiful people" in French.
Beautiful photographs in french is de belles photos
'Beautiful view' translates to French as 'belle vue'.
Beautiful all over in French is belle partout.
You would say "Bienvenue à la maison mes beaux enfants" in French.
Beau Rêve = Beautiful Dream
You say, belle cousine.