A bit of progress. Scale is better and I am starting to be a bit more daring with detail, but still lots to learn...
Comparing my latest attempt (left) with my first try (right) I think I am pleased with the Mk II head.
Ears seem to be my problem area at the moment, though I am working on a method and they are better than my first go. The new head also has a bit of a Victoria Beckham pout going on, but this will be less noticeable once I get a nice moustache on the working version!
Next: Posting this head up to my brother for him to cast in resin. I will then use the resin copies as working models to customise and personalise (with hats and hair, etc...) before sending them back for final casting.