First, loving the cover. It was not even close to what I expected, which is always a good thing. If I question a bit about it, I'm pretty certain someone passing by it may as well, and isn't that what a covers supposed to do?
What about a story for those characters? I could see several options - one already mentioned where the silent dragon is hunting the dragonhunter. For me, I didn't take it that way cause... well, Dragons like that would probably have to be noisy. So if it's not hunting the guy, then what is it doing and why is the hunter so nonchalant about the Dragon being there?
Questions - it's what makes good stories into great ones!

wf