A British Regulator says she is. Earlier this month, the Advertising Standards Authority (the Authority) banned a Gucci advertisement (pictured below) after a complaint was filed arguing that the models pictured in the ad were too thin. The Authority is an independent agency based in the UK and is responsible for reviewing advertisements and ensuring that they met set guidelines. 

The Authority ruled that the model, Avery Blanchard, posed in a way that made her torso appear longer and her waist smaller making her appear "unhealthily thin." In addition, the model's "somber facial expression and dark makeup, particularly around her eyes, made her face look gaunt." Due to her appearance, the Authority deemed the ad "irresponsible." While a still of the image still appears in one of Gucci's Cruise 2016 Campaign videos directed by Glen Luchford, the fashion house has removed the images. 

A second advertisement featuring model Maddison Stubbington, was not deemed irresponsible by the Authority. The Authority reasoned that “her legs, while slim, appeared to be generally in proportion with the rest of her body, which was not excessively slender or underweight — for example, her knee and ankle bones were not overly noticeable.”

source: NY Post