10 images in 250 steps. Trigger and useful keywords as follows.

Appearance: sdxl-lotta-otus, blonde hair, ponytail, blue eyes, long hair, small breasts

Outfit (school uniform): socks, shoes, school uniform, loafers, skirt, white shirt, brown shoes, white socks, long sleeves, kneehighs, blue skirt, pinafore dress, bow, red ribbon, blue dress, collared shirt, buttons, red bowtie, puffy long sleeves, pleated skirt