Nice attempt, but I have a few crits

Pay attention to the dragon's width, because some of it was skinnier, while some is wide.
You should draw a circle/oval fist for the head (Which will be erased of course when you're done) than you draw the hair, so your head would be more head-like and not mutated. The hands should be longer; if you're character is standing with his arms and hands to his side, his middle finger should reach the middle of his thighs. The hand is 1/3 of your arm's length, and you're ankle should be skinnier compared to your calf.
Great job! Keep on drawing

D