Chigusa Midori/Bloom Broché from Henshin Heroine ga Aku ni Ochita Hi, a manga series by Group Gohan Oomori.
On the chapter 2 translation, she's called Blossom Brooch. This time around I was a bit torn about using either Bloom or Blossom, but ended up choosing the former.
Description
Bloom Broché - bloomblossombroche, magical girl, 1girl, solo, green hair, very long hair, ponytail, wing hair ornament, light green eyes, choker, light green shirt, wide sleeves, juliet sleeves, light green gloves, neck ribbon, brooch, dark green skirt, green skirt, layered skirt, green pantyhose, light green ankleband, light green shoes,
Chigusa Midori - chigusamidori, 1girl, solo, green hair, long hair, half updo, dark green eyes, white shirt, short sleeves, blue sailor collar, yellow neckerchief, blue pleated skirt, black kneehighs, white mary janes