I like the wood, the finish and also the shape. My guess is the wood is Padauk. If your lathe, floor, work bench, body, etc. were covered in creapy red/orange dust, then it is Padauk. The wood does turn nice and I've had good luck with BLO/CA finishes on it. If this wood is Padauk it will darken with age..... exposure to light/heat. But it will remain beautiful!
The only thing I'd do different is I like to undercut the bottom of the wood blank so when you screw on the stopper the edge of it is recessed/hidden by the wood. No big deal, but I like that look.
I've used all kinds of stoppers(Chrome, stainless, cork) and I like the style you used the best. I still do some cork ones (flor cork) as some wine people have a thing about natural corks. But in my mind the one you are using is a good one, it shows well (better than cork) and I like the way they fit the bottle.
Turning these things can get addictive!
Again, very nice work!