A weight of ~1.0 is recommended (You might want to adjust the weight depending on your model). Feel free to experiment with other weights and share your results if you want to!
The main prompt is "HitotsuyanagiRiri". Use "short hair, clover hair ornament" for her hairstyle.
For her outfit try the following prompt: "HitotsuyanagiRiri, short hair, clover hair ornament, yurigaoka girls academy school uniform, black skirt, white thighhighs"
Let me know if you have any issues.