I am sorry to hear you're disappointed with your result.
You describe yourself as African Cuban. Although every individual is unique, there are some generalizations that can be made about the noses of people of African-- Cuban descent.
In general, the skin is very thick. The cartilages of the tip tend to be weak and have a more round angle to them. The tips of the cartilages also tend to be wide apart.
Rhinoplasty is challenging in people with this kind of nose. The reason is that the cartilage must be shaped aggressively in order to provide more definition. Since they are weak and more round to start with, this makes it more difficult to achieve the desired result.
Also, even if the cartilages are shaped exactly as desired, the thick skin will "hide" the result to some extent.
For these reasons, it is often difficult to make the nose very narrow and defined.
However, if you are disappointed with your result, I recommend you obtain a consultation with another surgeon who may have more experience with your type of nose. It is possible that another surgery might be able to give you a result you will be happy with.
Just realize that because of the limitations I mentioned above, it may be impossible to get your nose extremely narrow and defined.