Hi! Just a little correction on your question... Instead of 'You would use', the correct way when asking someone a question is 'Would you use'.

"Bewitching" and "beguiling" are good choices, since they each have connotations (i.e., implied feelings) that the beauty is unnatural, or that it may cast a spell over people and make them behave in unnatural ways. I am a writer, and I would probably use a metaphor or simile or some other figurative language instead of trying to use only adjectives. For instance: "Her beauty was a siren song." "Her beauty was like heroin, and I was hooked." "Her beauty aroused in me a curious mixture of fascination and shame."

Perhaps "breathtaking" or "stunning".

If someone is so beautiful that they make you feel shy or nervous, I might describe them as 'intimidatingly pretty.'

extremely beautiful.