FACES TO WATCH SHANICE WILSON

''When I was in elementary school,'' recalls Shanice Wilson, ''they called me 'Smiley' Wilson. I used to smile all the time.'' She's still smiling, and can you blame her? With a single-called ''I Love Your Smile,'' what else?-soaring toward the top of the pop charts and her album Inner Child just taking off, the 18-year-old, L.A.-based soul singer is finding the kind of crossover success that her label, Motown, made a tradition 30 years ago. This isn't her first foray into records; she released an album for A&M in 1987 and scored two top 10 R&B hits there with ''Can You Dance'' and ''No 1 2 Steppin'.'' Though Wilson has been performing since age 8-when she was in a Kentucky Fried Chicken commercial with Ella Fitzgerald-she says she wasn't pressured into the business. ''My mom sat me down once and asked me, 'Do you really want to do this?' And I said, 'I want to do it.''' So does someone else: Later this year, Motown will release a debut album from a new duo: Shanice Wilson's mother and aunt.