You have a pretty solid grasp but could benefit from thinking of the tip of the nose as a ball or rounded box. The key here is that it is rounded. Then the nostrils are also rounded ovals. Once you have the perspective correct with these shapes, the shape of the nose just needs to follow the contours of the spheres and ovals. You can clearly see where the lines of the nose need to land as well as where the shadows will go. Hope this helps and with some practice, I’m sure you will improve as you already have a good base on this subject.
Thanks! I will try it. I think that will help me alot :)

