Looking good.

You might want to put a few more coats on, though it partly depends on how shiny you want it to be. Each coat is very thin, so with 4 coats there isn't a very thick protective layer on the guitar. People here (I have no experience with TO yet but plan to later in the year) generally think that 20 coats is about right to be able to sand it down flat and then polish it for a really glassy finish. If you like a more satin finish without sanding, then maybe 10 would do. But it takes very little sanding with 1500 grit paper to get through 5 coats of finish.

So whilst it may look good now,the thinner the coating, the quicker it will rub away and parts will be back to bare wood. You can always re-apply the TO, especially if you leave it as a satin finish, but it's likely to start looking patchy if you do so as some dirt is bound to get rubbed into the wood once it becomes exposed unless you reapply some TO very quickly. Probably not a problem on the back of the neck, but less so on the body.

There's always a compromise on finish thickness between very little and letting the wood vibrate more, and a lot thicker protective finish that dampens some of those vibrations. It's your guitar, so the choice is up to you; but unless you just plan to play it a bit then hang it on the wall, I would keep going for a bit longer.