If you make sure that you exert the pressure not with the tips of your fingers, but at the first knuckle of your index and your thumb, then the tips of your fingers will be more controllable. In other words if you press the first knuckle of your thumb and finger against each other, the tips of thumb and finger become a valuable tool to pinch the clay with. Squeeze the face area some more. Put a finger on the skull's face and press in with the nail of your thumb on the back of the chin towards the face. Give the lower jaw a sharper edge by squeezing between the index finger and thumb.
Next step is the nose.
It is a reversed V-like hole made using the needle in the center of the face, more to the lower part of the skull than to the upper, but by all means between where you think the forehead and the teeth should be. Now the eyes - make two holes on both sides of the nose area with your pin, but slightly higher than the nose. Make sure they are some distance from the nose, as they will be widened. Widen the eyeball hole by twisting the pin around. That should make a nice big round hole.