If the person is attractive enough, yes, modeling would work. News anchor, host or hostess, real estate sales person.
When I was better looking and younger, I hid well the fact that I was vain and somewhat conceited. I loved seeing myself in the mirror when I worked or guided a tour. Lots of people thought I was super intelligent and attractive. This helped me to perfect my appearance and techniques. I kiow I was conceited because I liked being in the center of attention, and some people perceived me as being condescending or a know-it-all.
I quickly learned that the presentation I made is what made me look good. Not that I was talented or good looking,
Any position where you present something and do it with flair, is a good match for a conceited person.