original headstock shape Toshi looks pretty cool. I'd probably do a bit more sanding to get the curves flowing and try and eliminate any rounded edges that aren't round, if you understand what I mean. Sorry buddy but you will be a sanding expert after this build hhaa
Another thing you can do is place the headstock over the body shape and I try and emulate some of the curves of the body and horn shapes.
You have done a good job with limited tools and I assume in a small apartment where you can't create too much dust without upsetting the wife !