Informal upright single trunk Buxus sempervirens progression

I bought this Buxus sempervirens in November 2010 as a nursery grown plant. We rarely get this size plants so I was quite happy to get it:
Pic middle January 2011:

In the same month I cleaned up the tree and discovered a nice informal single trunk upright in there:
Side A:

Side B:

Side C:

Side D:


After letting it grow out for about three months after the cut back I styled some of the branches:
Side A:

Side B:

Side C:

From April 2011 I let the tree grow out freely. This is the tree in January 2013:

I cleaned up the tree a bit and this is the tree after the clean up:


I am very happy with the trees progression up to January 2013. I will have to be realistic about the outcome of the tree - it will have to be styled femininely.

From that time I have let it grow out again. I will probably have to place the tree a little bit deeper in the pot because of the three thick roots. Over a long time I will get some new roots to replace the current ones.

Any comments or advice on the tree will be appreciated.

Lennard