As noted in tamagotchi.com website, your tama needs at least 80 artistic/fashion skill points in order to receive this job. However, as quite a number of users noted, this is not always the case. Weight is also apparently a factor for acceptance. I've had a Makiko get rejected in an "artistic" job because its weight is 99 lbs. To think that my Makiko had over 400 artistic/fashion skill points, this is quite surprising.