Out of the 3 I really like the "Walkman Girl" the best. It reminds me of The Silent Age game.
It has that retro/hip feel. My suggestion would be to exaggerate more. The walkman is hard to spot and its the "defining" trait of this character. Make it pop out in a oldschool red or creme color (look at old walkans) and maybe have the chord and red earmuffs on her head. I remember having a Sony Walkman with bright red earmuffs

That would look great against her dark clothing i think