If Looks Could Thrill, They'd All Be Stars

Isabella Rossellini
High point: The chip-toothed supermodel (Vogue, Harper's Bazaar, Mirabella) credibly portrayed the victim of a gas-sniffing maniac in David Lynch's 1986 film Blue Velvet. Low point: Costarred with Mikhail Baryshnikov and Gregory Hines in her first Hollywood film, the dance-for- freedom dud White Nights (1985). The last word: As the daughter of Ingrid Bergman and Italian director Roberto Rossellini, she seems to have film stardom in her genetic cards.

Tom Selleck
High point: The onetime Pepsi and Salem cigarette man scored big as TV's Magnum, P.I., but his film career has fizzled except for 1987's Three Men and a Baby and its sequel, Three Men and a Little Lady. Low point: He hasn't appeared in a movie since he struck out in 1992's Mr. Baseball, Christopher Columbus: The Discovery, and Folks! The last word: He could be the next Bert Parks if a hot TV show or movie doesn't come along. Soon.

Cybill Shepherd
High point: Spotted on the cover of Glamour, Shepherd made a stunning debut in 1971's The Last Picture Show and later delighted audiences in TV's Moonlighting, but was trashed for almost everything else. Low point: 1975's At Long Last Love, which tarnished the careers of Shepherd and director boyfriend Peter Bogdanovich. The last word: Her post-Moonlighting movies have flopped, but she has been good in a steady stream of TV movies and has a sitcom debuting in the fall.

Brooke Shields
High point: After a childhood of ads (Ivory Snow, Breck shampoo, Calvin Klein jeans) and years spent as a teenage sex symbol, Shields had the good sense to temporarily put aside her film career to attend Princeton. Low points: Any number of painful-to-watch films, including 1983's ''adventure'' Sahara and 1992's Brenda Starr. The last word: Other than a small part in last year's offbeat comedy Freaked, Shields is doing us all a favor by spending her time with Andre Agassi rather than on screen.

Twiggy
High point: The skinny '60s icon (Elle, Paris Match, Vogue) won raves and a respectable run in the 1983 Broadway musical comedy My One and Only. Low point: Her TV series Princesses (1991), which could have established her with U.S. audiences, vanished after a few episodes. The last word: Despite a strong debut in The Boy Friend (1971) and her Broadway triumph, her promise has gone unfulfilled in small parts in a few films, including The Blues Brothers (1980), Madame Sousatzka (1988), and John Carpenter Presents Body Bags (1993).