If you're looking for manga similar to Helter Skelter: Fashion Unfriendly, you might like these titles. All recommendations are made by Anime-Planet users like you!
A woman plummets from the roof of a building. But who she is and whether she jumped, fell, or was pushed remains unknown, as the body was too mangled by the impact to make out her features, and she carried no form of identification. The sole clue to her identity is her cell phone which contains only two numbers: a woman claiming to be her twin, yet who has no official documentation; and the popular author Shun Mizorogi, who remains secretive about his relationship with the deceased...
Helter Skelter and Utsubora are about extremely popular models/authors who secretly turn to plastic surgery or plagiarism in a desperate attempt to maintain their top position. Both are psychological, dark, and sensual. Furthermore, Kyouko Okazaki and Asumiko Nakamura both use a very stylized illustration style which I think will appeal to the same audience.