Everyone has different problems, and they have to be detected - by a teacher, a coach, and eventually by a conductor. They have to be faced and discussed openly. Even if the verdict is negative, one has to be truthful with a young singer if one is asked for an opinion. Don't forget that diction, stage deportment, and technique can all be improved by good advice and guidance. The only thing that cannot be improved is the basic instrument.
Some voices are extraordinary, some are beautiful, some are interesting.
It's important to know what is best for you to offer and to be honest with yourself about your abilities. In the majority of cases, you cannot fool your auditioner or the public. Before engaging a young singer, the first thing I want to discover is personality. If I can see the fire and individuality in that singer, then the next thing is still the voice. The other important things, especially in today's world, are musicality and physical appearance.