Smaug!
http://www.youtube.com/watch?v=rWVeZx2IP30
http://www.youtube.com/watch?v=T3WjqVWFhFM

If you have seen The Desolation of Smaug and don't think Smaug is the most epic thing ever then you must re-watch the movie lol (just kidding)
To me, everything about him is just incredible! The animation, the model, that (Benedict Cumberbatch) voice! :D Oh yus! Most amazing dragon ever(well, tied with Toothless of course lol ).

So yup, not really a sketch anymore XD Dunno what to call it since the BG has lineart and the lines are still slightly sketchy(I cleaned them up a bit though). But yeah, SMAUG!