A speaking voice is considered to be pleasant when it is warm, full, and RESONANT.  Since Resonance is determined by the shape of our head, mouth, and face, we need to learn to work with what we've got. Experiment with directing the air into the THREE reverberating cavities in your head.  ONE- your oral cavity (mouth),TWO-your nasal cavity (nose), and THREE- your pharyngeal cavity (back of the throat). By taking away and adding any of the three, you will probably discover how many recognizable entertainers create their signature voices. But , to sound the most like yourself, you'll want a balanced combination of all three resonant spaces.  Use what you've been given!