There is a lot to love in this work. First of all is your depiction of a teenage Spike. It's really good and, in my opinion, very well proportioned compared to what we tend to see in the show for teenage dragons.





You also did an amazing job with the colors. They are very vibrant. The background is truly astounding while not taking away from the subject. The background actually adds to the feel of the piece to show how Spike is resting while pondering where to go next, or what he should do about a particular matter. Perhaps he is even thinking about Rarity, or how it is to be on his own?





Lastly, I adore the facial features and expression. The way you drew the mouth makes Spike appear kind of like he is in an Anime. However, it could also not be an Anime, too. Lots of room to imagine how this particular portrayal of the young dragon could be animated beyond the still-frame you have here.