This is an English Box bonzai i made about 14 years ago. It was the first one i made and is not the best of my creative work, even among the other bonzai, but it's probably the oldest thing i still own (except my lego) and is my favourite creative work. It's sitting on an outdoor bench seat, with three slats for a backrest, if you want an idea of scale.
Provided you don't kill the tree, creating a bonzai is quite a forgiving creative process, if you make a mistake you just need to wait a year or two to fix it :)