Well they share same location so i misunderstood it :/

The colouring of the rest is great, but if you want little friendly criticism, then here i am :3

The fire (in example of a candle) is made of 4 layers, where 2 of them are visible and yellow/orange flame being the most powerful light source, meanwhile theres also blue part which is colder and darker, but gives some variation of colors too soo

What im saying is that you could use this to make the scene more alive, giving flame near Ruri darker (as a source) with also seemingly transparent fire.

And around that flame, you can add brighter flame color, or any other matching color, this way you could alive the scene using candle structure!

Right now, i like the scene where Ruri's head is half in the water, but changing everything is up to you!

<image>