Very nice- I like the colors here but I am a little confused about where the lighting source is coming from. I know that this is just a doodle but I would point it out you can definitely see the blue light from the water coming up but it also looks like there is lighting above the girl's head that is shining down. I feel like the setting wouldn't be dark enough to see the blue light from the water if there was a light source coming down too
But great doodle either way! please excuse this long comment!
I love their expressions. She looks as if she is off thinking of something sad and deep and the dragon is looking at her as if he is sad she is thinking of such things. Hehe. If that makes any sense. Great colors too!