Firstly, the type. I understand it's trying to be unobtrusive but its still too hard to read. And the font itself is too uniform. I'd drop shadow on the font or something else to make it pop out a little more, but at the same time change the font type to something that flows a little better with the clouds. You may even want to consider writing it by hand.
As for the angel thign at the bottom, you might want to imply the creases on the side fo the mouth with shading instead of lines, because it makes the mouth look a little odd. Your eyes are wel rendered as are the folds, but the hair looks conparitvely simplistic. Id work on making highlights and lowlights of more individual strands. I can tell this is a girl, but you might want to deepen the hue of the lips so other people are more certain.