The right side should fill in nicely with a bit of repositioning of the lower branches on that side and growing out. Often the artist strives to create a welcoming stance with a more open view of the trunk line, branch positions, particularly in the bottom two thirds of the design. The branching on the right and left can appear to invite the viewer in and flow the eye up the tree.That would also be accomplished with shifting one or two lower right branches to the right a bit more or just reducing their downward angle a bit. You can experiment with what feels right from your viewpoint. The only other consideration for styling at this point may be to reduce the length and amount of foliage on the lower left to tighten up the design. By that i mean balance the flow and amount of foliage in proportion to the size of the tree and overall design. How much foliage should a tree with that size of trunk have in nature?
I think you are making great progress and will be surprised how quickly the design will come together. I hope my comments make sense and interpret the direction that you wish to take with this tree. I believe the best approach is smaller changes, gauge the result, then more if needed. The great part is at this stage with trunk and branch placement basically decided the foliage can be grown, tweaked and or regrown.
Well Done. Feel free to ask questions, discuss options. Others may share a different view and add to the mix. Also feel free to discard my comments if you feel they do not fit your vision.
Best in Bonsai