If I was really nitpicky and stretching for any excuse to find something wong, I'd say maybe your main subjects are disappearing into the background a little bit. Other than that I think it depends on the kind of story you're illustrating, I think the coloured pencil with the slightly sketchy outlines is a nice dreamy look, and in this particular piece love the contrasts between the red and brown desert colours with the blue of the sky and the green of the oasis :)