I'd say that you're right, but then again I haven't seen a dragon smoking a pipe either. So a little artistic leeway is in order here.

The smoke is done really good, and the colors are cool. I give it a thumbs up because it looks very well done. I like how colorful his tummy is. Shading is decent too... I would have expected that it would have been done a bit differently, but that was before I saw your reply about how they're more shiny underneath, so that's well done too. I'm not sure what I can add to this, other than to say keep up the good work. Your art is definately improving compared to some of the older works that you've done.