"It’s not just black girls. It’s ethnic girls in general: Brazilian girls, Hispanic. You really don’t see a lot of Asians either. A lot of designers think that if every girl on the runway looks exactly alike, then people will come to the shows and buy the clothes because they won’t be focusing on the models….It’s not even just runway either… us ethnic girls should be getting a lot of the covers too!" source
I personally have worked in the fashion industry and the only way to solve this problem is for us to own modelling agencies , support designers from varies ethnic backgrounds , and develop our own industries that develop a healthy image of women.