Nice start! I would try playing with the composition and sense of scale to really push the whole image. Some things include: playing with the depth/variety of rocks/mountains you have in the foreground and background, appearance of the leviathan, and how the leviathan is interacting/not with the heroine in the main focus.
You could check that girl's anatomy first. She has no forehead, too large eyes, and every part of her body is too short. Her ears are now placed on the back of her head so you might want to change that too. The hair in front of her mouth makes it look like she's a duck.
Overall a cool design 
Not trying to sound rude, btw. I really like what you have now. 
Great job so far!
The image right now have a lot going on in the top third of the canvas space with the girls head, the serpents head and the mountains in the distance. Bringing some of it down a bit might give a more balanced feel to the composition.
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