Signature Design

The "B" in YAIBA makes it look like Y A I IB A, so maybe another font or editing the glyph would help that out.
Japanese text feels a bit too small and close to the text, maybe try bumping up the size or finding a bolder styled font for that.
For the clouds I would suggest maybe offsetting it a bit so they're not basically lined up along their bottom edge or using two different clouds instead of just having a big and small one that are identical.
Also maybe try dimming and adjust the white of the cloud to better match the color of the torii, since I feel the text should pop out more, but the white of the cloud is the densest, brightest part of the entire image.
Another option would be to use smoke or mist, since you can control the opacity of that a bit better and layer them to make different levels of wispiness.

Otherwise, I really like the colors you got going for this, I'm a sucker for muted architecture and the petals are a great highlight.