I think it has a transparent background.6.5/10 because, while the background just being white bothers me for some reason and the pose is kinda meh, it's still a Hydreigon and Hydreigon is cool.
He is looking up in the artwork, that probably explains it.The art is good and I like the image, but it's a tad too close since we can't see his neck. (Though if it's because of the image itself, then that's fine.)