Workflow:
Initial image generated with NovelAI
Upscaled with Artiwaifu-diffusion-v1 w/ 4x_NMKD-YandereNeoXL_200k using 4 separate passes at 33% upscaling each
Adetailer for the face and hand holding the mask

Prompt
[artist:ningenmame], [artist:ciloranko], [artist:sho sho_lwlw], artist:tianliang_duohe_fangdongye, artist:as109, 1girl, fox mask, holding mask, :D, green eyes, black hair, short hair, kimono, festival, fox ears, fox tail, multiple tails, fox girl, huge breasts, cleavage, standing, upper body, night theme, lantern, best quality, amazing quality, very aesthetic, absurdres

Negative prompt
lowres, {bad}, text, error, missing, extra, fewer, cropped, jpeg artifacts, worst quality, bad quality, watermark, displeasing, unfinished, chromatic aberration, scan, {{mole}}, scan artifacts, {{artist name, copyright name, artist logo, weibo username, weibo logo, weibo id}}