Hello catfish chapstick... I will say that for someone new to the art, you seem to be grasping the concepts of balance and movement quite well. The material you are working with is young, so you have done all you can to it for now. Now, you can apply what you have learned to older material.
One thing I can tell you, on branches that you want to thicken up.... It is a good idea to let that particular branch and foliage grow, somewhat, freely, without pruning. If the branch is left alone to grow, it will thicken faster than if you prune it. If you trim the folaige and the branch, it will slow the growth of that branch. Branches that are relatively as thck as you want and in the right proportions, can be trimmed up. However, overall, with younger material..generally, the whole tree should be left to grow somewhat...Once again... good eye structure.
I hope this was helpful
Rob