What do you think of her advice?

What do you think is the greatest masterpiece in the history of art?
芸術史上最高の傑作は、何だと思いますか？

What do you think is the most important issue that the world faces now?
今、世界が直面している最重要問題は、何だと思いますか？

What do you think is the most important thing?
最も重要なことは何だとお考えですか？

What do you think is your worst weakness?
《面接》最大の欠点は何だと思いますか。

What do you think of
～をどう思いますか？

What do you think of a guy who gives you a poem every day?
毎日詩をよこしてくる男って、どう思う？ 

What do you think of her advice?
彼女のアドバイスをどう思いますか？

What do you think of his idea?
彼の考えをどう思いますか？