Paradise Kiss, Torikagosou no Kyou mo Nemutai Juunin-tachi Recommendations
Both series feature a female protagonist who models for an artist and, over time, grow affectionate toward that artist and the place in which the art is done. Mind you in ParaKiss she's a model for clothing whereas in Birdcage Manor it's modeling for paintings.
Both protagonists have a sense of independence and rebelliousness at that high school age.
A character in ParaKiss is transgender and in Birdcage Manor there's a part-time crossdressing character featured.
Neither protagonist really fits into a super common trope for characters. They're realistic and I wouldn't think it odd to see either in real life. This is in contrast to the plethora