Nice model! Yeah, another spline ring around lips and probably eyes too. Make sure there's a spline ring close to the lips on the inside of the mouth too for those Ooo sounds. That cp with 3 splines coming out of it (naughty).....the discontinuous spline should probably continue up to join up with a spline coming out of the eye. The spline you replace could go over the nose bridge.
Finally, maybe abit more chin/jaw? It might be hard to get his mouth opend wide otherwise.
PS Also, you probably would need another spline between the eye and nose. Without it, the nose will turn to mush when he blinks.