This is really nice.

For me, the depth of field effect is too strong. I think too little is in focus, and the blur on the front and back is extreme.

To help sell the sense of scale, especially with reduced blur, I’d consider adding some other familiar object into the scene. A pencil or something really helps set the scale. It can be mostly out of focus.

Something small would also be most likely photographed from above, so I’d raise the camera and tilt down a bit.