Hi Loz.
Good attempt with a very difficult wood to finish well.
By the looks of the top surface you have used a scraper to finish, before sanding. It has pulled the end grain around the inner edge, generally with any pine timber you must use a VERY sharp gouge, and no scapers.
Also you need to spend a lot more time on your sanding procedure. DON'T move on to another grit until the one your using has removed all marks from the one preceding. Then on these soft timbers, stop the lathe between each grit and hand sand with the grain. It really helps to remove the sanding circles.
An very commendable attempt, but as I said you didn't do yourself any favours by using Pine. It is not a easy wood to work well.
Hope some of these tips help.
Also the timber doesn't look like Pitch Pine to me, but it may be the photo. Normally the grain in Pitch is a lot darker, almost a dark chestnut colour against a orangey background. Of course the final check is always cutting this wood, it has a fantastic aroma.