A little constructive crit: the colour boundary between the blue mountains and the yellowed middleground is too sharp. Bringing some of the light blue-grey into the middleground and the warm yellow-grey into the mountains would blend the boundary and make it more natural.
Did you do art for Guild Wars 2? I could swear this has that art style, and it's a GREAT style! That must be where you've been this whole time, Art for GW2, as it had HUGE dragons, and I've always loved your HUGE dragons!
I just posted a similar comment reminds me of all those awesome painterly loadscreens. I would be amazed if anet didnt have someone as talented working for them just wish they made the dragons this colorful.