Well done Barrie, there might be a few minor errors, but overall that looks pretty good. I like the quirky half grin. you'll find it'll look more natural if you put a neck under it. Two areas I would look at are, as you say, the ears but also the size of the nostrils. A good trick is to hold it up to a mirror, that generally shows up any problem areas. When you really get going, I think you'll really enjoy faces. Best wishes, Gary.