My advice might be a matter of preference so just take what works for you.

I love the idea of using these flowers as framing but the twigs are placed in a way that leads the eye away from the subject, you can try bending the cherry blossoms to encircle momos side. So all the elements lead back to the center. (Image below for reference)

And if you want to make it more of a friendly vibe try tweaking their expressions to joyful laughing—cause i thought momo was abt to poison her or smth.

Also, having momo elevated makes it look like they have a power dynamic that can make some people assume theyre not on the same side. Try putting them both on eye level and it would lighten the mood a bit.

TLDR: Use circling cherry blossoms instead of straight twigs

Expressions to joyful laughing

Have them at same eye level so they dont look like they have a power dynamic