This is probably starting to seem like spam, posting tiny updates every day or so, but I'm doing this to make sure that I keep up on this.

So, obvious change is the first pass on the ears. They're a bit rough right now. More subtle fixes are in the mouth/chin area. I changed up some stuff in the jaw to match the drawings a bit better, and fixed up the mouth to make it not look as much like he's puffing his lips.
Also, I'm really damn slow at modeling.
UPDATE:

(Don't judge the brow/mouth to harshly, they need some work)
Per request from Dave, and a response:
I like the ears at the size they are, it makes his head a bit less tiny compared to his body. I do need to adjust the placement a bit, but there is something I like about them being further back. That, in combination to the way his brow/nose looks, gives him a tiny bit of a bird-like face. I keep thinking of Sam the Eagle actually. Which is awesome. The ears probably do need to come forward a bit and fan out slightly. But this is just a first pass on ears. I want to fix some stuff in the eyes/brow first.
I'm also thinking the head is too wide right now, might squish it a bit.