I agree that the appearance is natural and graceful. It does a good job of representing the natural character of a Japanese Maple, which is delicate and refined and very much not the "pine tree shape" that deciduous trees are often forced into accepting, and it is a suit that often doesn't fit very well.
One of the most significant characteristics of this is that the branches ascend. If you don't follow what I mean take a look at this tree and then the next deciduous tree you see in a garden or yard. You will probably find that the branches rise, split and refine, then rise some more. The general silhouette varies with the species, but some trees are certainly oblong or ovoid like this and not triangular at all.
I think this is the kind of tree would appeal to Dave deGroot, who is curator of the Weyerhauser Bonsai Collection in Seattle, WA.