Here’s some suggested edge loops. The blue line gives you another loop around the eye. The green loops provide loops around the mouth, and give you the possibility of making the crease that runs from the nostril to the side of the mouth during a smile (the inner green loop is the base of the crease, the other loop lets you push the cheek out). You’ve got some unneeded poles (places where three or five edges come together) around the nose which can be converted by adding another loop around the mouth (the mouth is very mobile, hard to have too many loops around the mouth). Finally, run a loop across the forehead, down in front of the ear then along the jaw line to define the face and give you a loop to open and close the mouth by moving the lower jaw.
Fantastic first model! mr_bomb’s got an ear tutorial, too. Looks like you’re learning from the best, and it shows.