I really like that samurai digi a couple posts back! As for getting smooth lines, the best way to get those is relentless practice, and confidence in your actions. Like you're more focussed on the process than the result? That's maybe a vague description, but i have found i get more mileage when i stop worrying about getting the picture right. Hope that helps. But you're on the way there, that's no prob.
Wow I adore your quick sketches on top of these page.I so neat to see all the tries with the faces,poses and animals.And awesome job trying to get practice every other day or so with the landscape studies.