Don't get frustrated yet mate. At first glance one may not see any change. Maybe if you had suggested what your aim was, or what you did, you could have got more feed back.

As far as I can see: the sky is layered so that it darkens nearer the top closest to space like in real life. The plane is also layered to increase contrast between the shadowed areas and fuselage. The edit also has a slightly higher saturation.

As the others said, these are slight changes overall and not overly "spectacular". That may be why you got so little feedback. Nontheless, you seemed to have worked hard.