Your shading is wonderful, from a bare first glance it does't resemble pencil. It's solid yet flowing as it changes, and you easily make the same color contrast - here, where the head meets the neck. Quite well done.
That is a nice portrait of Toothless, which nicely mimic the style of the movie "How to train dragon?". With sweet chosen pose, traditional pencil crayons has warm effect. But should his wings be more visible in this pose, shouldn't it?