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Most of your lines and cuts look really straight and intentional, well done. I think I'd like to see more delineation between the bowl and the shank yet - really get them separated because the lines are otherwise very clean and austere.
The stem relates to the stummel in no particular way - doesn't flatter the rest of the shaping or work to harmonize anything. So I'd ditch the ring and keep with the lean clean look the rest of the pipe has.