Tero you are to be applauded for trying out new techniques to you. To some extent I agree with George's comments, you have gone to all that trouble and the form lets you down.I have to say also, and I realise this is your first attempt, but some of the layers appear to be poorly glued together. It would be better when this happens, and it does to all of us from time to time, to part those rings off and reglue them.
Although segmented items can be made from soft wood you may find that making them from hard wood goves a better result.
However, you have now gone through a learning curve and I fully expect your next one to be even better.Well done.