Did you mean 'Ay! que hermosas!', if so: 'Oh! what beautiful girls/women!'
Or, because Spanish words are all masculine or feminine, and 'hermosas' is feminine plural, it could mean some objects, for which the nouns are feminine in Spanish, are beautiful, e.g.
'Ay! que hermosas (manzanas)!' = 'Oh! what beautiful (apples)!'
Ay! que bonita = Hey, how beautiful you are ! ('Hay' = 'there is/are')
means 'what a handsome couple'.
"As you know that I am beautiful."
beautiful like you know
How beautiful my brother is
"Que hay" is a question that means "what is there..."
Maybe you mean "Que bonita" which means "How beautiful!"
As you know I am pretty OR How do you know I am pretty
"Que hay en tu escuela" in English means "What is in your school?"
"Y que nunca se te olvide que eres muy bonita" is Spanish for "And don't you ever forget that you are very beautiful."
It means, "What is there [that's] good?"
What a pretty thing, they're bringing you out well