I agree with the Reddit folks it could be optimized ever so slightly. My guess is that the image is front-focused a tiny bit, so the focal plane is a little in front of the bottle. It's a bit of a guess since there's no subject matter there to verify against. If you want to verify proper focusing, you'll have to resort to boring stuff like photographing rulers and whatnot. However, this sounds like a good plan to me:
Have fun!
Have fun!