Bouganvillea update

Hi IBC members,
This is an update on my Bouganvillea please guide me on what to do next..

This is what it looks like 3 months ago and this is one of my first bonsai project..





Now:




please provide me a virtual for me to follow, I don't have any idea on the design..

I also want to improve the root system, what kind of method should i do?


Thanks in advance IBC!