Acid,
Have a look in the topology thread in the WIP section, nailing good topology on your model will make it much easier to give the character some facial expressions, it takes a bit of work to place all the edge loops bit its well worth it in the end as you can get more detail out of a lower polycount due to the edges matching the flow of the facial muscles, turst me it will be worth it in the end.
"No pressure, no diamonds" Thomas Carlyle