Thanks dude. I really do need to start using shadow/ light to define things.
That no-lines image was just me hiding the line layer after I'd finished; I hadn't attempted to tighten it up without the lines. Excellent advice, though - lines do tend to jumble things up, which is why I left as much line as I could out of that last one. I need to touch up the yeti kill in that respect.
quick-ish character attempt before bed (as in, I'm sure there are some lighting mistakes that I will notice once I've gotten some sleep).