I feel like there's a little bit of grain in the black. It should either be a dark brown or a black but it's a bit in between and there seems to be some noise in the image. Also the girl doesn't look like she's in focus so maybe an unsharp mask and then use the burn tool to make the darks black. The image behind looks a little off to me but I don't know why. It fits fine but the clouds look so dark but not really contrasting enough.