create a polygon sphere,
use the divisions you like... not too many (start simple),
with split polygontool you can cut the mouth, eyes, nose out and start tweeking some points...
..to see this in a more smoothed mode you can make it a subD
<modify/convert/polygon To subD...>
..tweek a bit more and go back to polygon mode
<modify/convert/subD To polygon...>
and so on...
This is the way I kinda model but I wouln't create the mouth, eyes, nose out of the sphere...
Everyone has it's own method..
Try searching for tutorials of how to create a head and you will see many methods of doing it...
hope I helped you a bit..