When drawing three quarter views, remember the silhouette of the face (raorbital ridge and cheekbones standing out) and the eye caves. I tend to position the eyes too close to the nose or too far ahead, but it’s important to remember how deep they sit inside of the skull. Maybe this video showing the trick of imagining an eye mask may help you as well. Draw from references to memorise the position and then try from memory.
If you have difficulties drawing noses from this angle, try to think of them as a pyramid sticking out – place the pyramid on the skull and draw the details on that pyramid. There is a good tutorial video from Aaron Blaise explaining the masses and details of the nose.