A couple more notes. I don't normally paint eyes on 28mm historical models. It's not because I can't - I just feel like the effect is more realistic leaving the darkest flesh tone. You can't see the detail of a person's eyes from a distance in real life, so they shouldn't stand out on the model from across the table! On the subject of eyes, you can't normally see the whites of a horse's eyes unless it is terrified. Certainly a rearing model or one careening into combat might count, but I normally just add a grey highlight to the black, especially with one standing politely and looking at whatever his master is pointing at...
Hopefully this series was of some use to you. Maybe some of the other guys will be inspired to chime in with their own painting tips...