Hikawa Sayo from BanG Dream.
It is 100 official pictures and autotags.
Example prompt for casual Sayo:

hikawasayo, 1girl, solo, green eyes, long hair, jewelry, pantyhose, necklace, looking at viewer, dress, short sleeves, aqua hair, blush, collarbone, black pantyhose, pendant, closed mouth, bangs, frown, swept bangs, bow, cslsk

School uniform Sayo:

hikawasayo, 1girl, hanasakigawa school uniform, solo, long hair, green eyes, school uniform, double-breasted, dress, looking at viewer, buttons, smile, long sleeves, neck ribbon, red ribbon, ribbon, aqua hair, bangs