Momose Michiru, a character by Isako Rokuroh / 6ro- from:

Natsutakenawa | Peak of Summer (COMIC HOTMiLK 2012-09) or [井硲六郎] 夏闌 (コミックホットミルク 2012年9月号)

The coloring used in the showcase images are just what I think she might look like in color.

Main Tag:

mmichi

Appearance Tags:

glasses, side ponytail

OUTFIT:

hair scrunchie, track jacket, track pants, tracksuit

Optional Tags:

All images used were monochrome/halftone images from the manga and where prompted as such. So if you like that add these to your positive prompt otherwise add them to the negative prompt:

greyscale, monochrome, halftone