You''l get the hang of the coals
To be honest, I wasn't holding out too much expectation for this, when you said that you'd be using the charcoals for a picture. A couple of detail issues that presented themselves would be the front legs and the wings, where the knee / elbow join isn't very prominent and there doesn't seem to be any bone structure in the wing itself, which I would have liked to see.
The background looks a little simplistic, with almost childish looking mountains, being just single triangles jutting up out of the page. A few more rogue angles here and there would certainly help it to look more natural.
The sky looks better, with the stars being placed in a random pattern - did you try to recreate any night sky here, or just place them where you see fit?
[Review Request Club]