Two words, Feather blending.
You made that background or did you take it from the internet?

If not, basically what you have done is taking a background, then adding a render, blending it some. But maybe it was just the animation you wanted to show us.

If its your first one, it kind of good. Similar to my first one. Maybe you should move it down a little. Would look better.

Add some border too ^_^