DEMOGRAPHIC
Age; late teenagers (16-19), a lot of her songs deal with adolescent issues, they're very childlike and her album cover has a little girl and animals on it.
Gender; females, as it is easier for them to relate to her, however not all of her songs have a specific gender as they are about issues that anybody could face, and so could also be aimed towards males. But for the majority it would be females as her album cover etc it very cute and girly looking, instantly giving it a more feminine feel.
PSYCHOGRAPHIC
Interests; she's very quirky with her music, i'd say the target audience is fun, vintage inspired females. the lyrics tell a story, so reading as an interest is good. She plays acoustic guitar in practically every song, so maybe a passion for the acoustic guitar and acoustic music.
What will they expect from our video?
As 'The Competition' is with an acoustic guitar, they'll most likely expect a cute looking girl performing with an acoustic guitar. also, the song tells a story meaning that they'll be hoping for a narrative video.