This is Wakaba Mina (若葉美奈), the heroine of the manga "ごめんね美奈ちゃん" by ま☆くわ.
Pony ver. of https://civitai.com/models/383676/wakaba-mina-v1?modelVersionId=428219
The SD1.5 version seems to have a better understanding of the original style, but I think Pony's response to the prompts is better.
Prompt: lora:Wakaba_Mina_Pony_v1:0.7 mina, 1girl, (black hair, brown hair:1.1), short hair, blue eyes, (medium breasts:1.2)
