This is one of the reasons why starting with the basic stuff is easier- both for the maker and for the theoretical buyer.
The engineering of this pipe sucks (sorry for the bluntness, but if you're making a reverse calabash shape with a fancy moutpiece, you need to take it).
First of all this shape only makes sense as a reverse calabash (which imho doesn't make much sense itself in 85% of cases). A standard drilling would be surprizing for anyone looking at this pipe and would inevitably beg the questions- why isn't it a reverse calabash? Also without the expansion chamber the amount of wood in the shank will make quite heavy.
The tenon is way to short. A standard length for a well made tenon would be around 15mm, depending on the diameter.
The airhole is way high in the mortise, it looks like it won't take a pipecleaner and may be a cause of wet smoke/gurgling.
You need to put a bevel on the rim, now it looks unfinished and will char very easily.
The thing that bugs me the most in this pipe, aesthetically, is that your block was just too narrow for this shape. You took an ebauchon cut and made a shape with a profile that is wider than the front view, making the sides flat instead of rounded. It would have been interesting to make the whole shape smaller, to fit the width of the block - you would get a tiny cute pipe with visually pleasing curves.
Learn to walk before you run
