Personally, I find the overall design quite stiff and disjointed - the tree looks unnatural, the gold branches and grass on the omote seem awkwardly rendered, and the rock on the ura seems to be melting into the stream (which appears to have been rendered hastily). Unless of course the rock is actually a waterfall, in which case it still looks a bit odd...
The overall look of the brass ground is homogenous and uninteresting, and the composition lacks depth or perspective. In addition, the various design elements are anchored awkwardly to the wavy "frame" around the scene (which serves only to distract from the monotony of the scene). I believe this contributes greatly to the lack of depth in the design.
The contrast between the moon and clouds is notable, though. While the work seems competent enough, it doesn't scream "masterpiece" to me like some works of the Tanaka school.
That said, I'm not familiar with the work of this artist, so I would be very interested to compare this piece with his other works, and learn a bit more.