Congratulations! I don't see a problem with the shot. I look at it this way, if you are confident in your shot, and you do *know* the anatomy of a deer, take it. A neck/head on shot is actually very effective considering there are so many vital options to hit, the windpipe, the heart, lungs, etc... you take the chance of hitting one or all of them. Also, your chance of wounding the deer are decreased because the brown available to hit with head on shots is a heck of a lot LESS when a deer is facing you, if you are off just a little, you will shoot right past, allowing the deer to walk away unwounded, if you hit it, chances are you've got a lethal shot put on it. To be able to hit that limited amount of space takes lots of practice and good shooting skills. All bowhunters know (or should know) their capabilities. You obviously knew you were capable of making the shot, knew you accuracy in shooting could get it done.
Kudos to you for your dedication and hard work this year. Patience always pays off, maybe not right away, but you will eventually reap the rewards of it. That deer is awesome! You deserve a pat or two on the back!
