Let me share my first experience in making a duet, I saw a TikTok by @cherry_bloso0m and was inspired by it to challenge myself with character design and rendering. I used 2 references, the original drawing and the rendering style from Hanako-kun's manga. I learned a lot from this and it's something I will do again. You can see the process on TikTok and of course ask any questions. Happy drawings!
Duet
Sketch and linear process
Rendering process
https://www.tiktok.com/@ckledianart/video/6995579475878481158?lang=es&is_copy_url=0&is_from_webapp=v1&sender_device=pc&sender_web_id=6995675402737305093