Here is Peter T. with is his prize winning tree (Midori Bonsai Club Show two posts down). It was hight time for repotting, because a tree well taken care of puts out lots of roots.
The picture below shows a good job of placing branches. When you go to bonsai shows, you can learn a lot about the skill of the artist by looking that the branch placements from below. 
This Sierra Juniper bonsai once belonged to Johnny Uchida. There were basically two complete bonsai connected at the base. The tree below is one of them. Johnny took the chainsaw and separated them. Then 13 years ago Akio Kondo carved the base of the separated bonsai to make the chainsaw-marks disappear.
Below is the tree after styling. Unfortunately, much of the interior foliage have been lost – somehow. Akio said it was more difficult to style for that reason. But Robert, the new owner, will get it full again. Time improves most things.
Well, Sue has gone through Boon’s Bonsai Intensive Training Program. She sat for the written test on her final visit this last time (By the way, the lowest passing score required is 90%. A great testament to the training and bonsai theory class is that Boon has yet to have anyone re-take the test.)
On the hands-on-part of the test, you are given a tree – that might be a little over-grown, that you must totally refine and wire. It was also time to de-foliate this Japanese maple on a rock.
Below, the tree is done. Boon was pleased with Sue’s work – and she looks pleased too. The Maple is was placed under the 30% shade-cloth and will stay there until the new leaves harden off – then it will be re-introduced to full sun again.
Click on picture for a closer look.
Bay Island Bonsai 