A well thought out piece for its use. Like others, there are many things that need addressing. I have watched some of you u tube videos and you seem to be using all of your tools like scrapers and this can lead to some tear out as I saw with this piece, I would advise joining a club or find someone to aid you in using the tools correctly this will help some of the problems. Even though you sand through the grits do you remove all of the marks from the previous grits if not then spend a little more time doing so? When applying finishes try to do so with the piece stationary and use a rag only applying thin layers otherwise you can drag the finish around the bowl leaving marks just like sanding marks.
Sorry for going on a bit but hope some of this helps, keep practicing and most important enjoy the journey