It’s no secret that social media is fake. Writing may be an inherently vulnerable craft, but it is still, to a degree, fake.
As a writer, you must choose which parts of yourself get shown to your audience. Even self-niched writers are still selective with how much of themselves they expose.
The profile picture and bio you use are the center of your author persona.
Your profile picture puts a face to the words. Your bio summarizes your core goal. Your bio is also the first place to introduce your unique voice.