Choosing C Hirajoshi was a good call; it gives the track a unique flavor, and the Yangqin sounds good (I love using Asian and MENA instruments in my compositions!). To push this toward the lake theme, I'd suggest pulling things back with more reverb, and granulizing some of the plucky and staccato sounds could add a really nice watery and bouncy texture.
Viewing post in Lantern Reflections jam comments
Thanks - I got really interested in the key and found it's a parallel of Sen which I thought sounded great too. I'm not much of a theory nerd so it's been great to push myself here! https://scale-mastery.com/scales/piano/in-sen/c
Your comment reminded me - I actually recorded some waves on holiday in Cornwall earlier in the year - I was meaning to add them but got distracted!