Ttell me, do you use pencils to draw and shade, because some of the shading seems too subtle to be pencil. I also must say, i admire how yours are all hand drawn on paper. Shelby here would usually seem rather nice, but there is that certain something that makes you think "whooie! she's hot." That little smile and the light in her eyes are very inviting, saying "hello" in a seductive tone, but her eyes also shows some mystery. It's like she knows something you don't. like she can see your deepest thoughts and secrets. Wow. I must ask about that thing on her neck. it seems rather out of place.
The thing i'm talking about is the round object to the lower right of ear ring. i can't tell if it's attached to her neck or if it's another earring. You said you use a Pilot 2020 0.5 Shaker. I have no idea what that even is. Does that mean none of the pictures are hand drawn?
I think as compared to the drummer, this bassist looks more like possibly a trouble maker, or it is just her eyes. Now the marks on this one to me that run along the back of the head, neck, and tops of the shoulders makes me think this one is a creature of fire and as if those blotches were cooled magma. I do also think the hat you gave her is quite distinguished as well just makes her stand out quite well.
She doesn't have any powers of any sort, actually... Nothing but pure bassist skills. The markings are also just black 'hexes' and her armor color is a bright green. I've got colored artworks of her in case you didn't know... Also, she's actually giving her affectionate look. She's hardly a troublemaker...