Somebody asked me for a clarification of what I mean by an umbrella style for this particular tree and how I could start one from a typical broom style tree. So instead of trying to explain by words, I think a sketch here would clear things up. The key styling point here, as seen in the last picture, is that one needs to have enough front and back branches to create a complete round canopy, just like all the spokes in an umbrella. And, the foliage should be cleared away from the inside of the tree, like the open space inside the umbrella. This open space beneath the tree is very pleasing, because one can imagine standing underneath tree and looking up into the branches and being sheltered by them. Most Japanese styled bonsai don't have this open space. I try to create this open space in most of my bonsai, especially for deciduous trees.
Hope this helps.
Si