It's good, for being first one.
Try to put a light source (by making everything else darker than in one place, placing sun rays coming from the light source, make the light source "lightier" than the other splaces)
Make a better bakground (Not just some fibers, try to duplicate the render/stock etc what is that, and make it so big it covers the whole picture. Put it behind the main render, and then smudge it with some nice brush)
Texts go smaller (The text is too large, and it is the center of attention, when Harry should be the one)
Integrate the render in the background (If you've done the bg like I told you before, try to smudge around the edges of the render a bit)
The text has some simple effects (Get some web styles from the internet, and use them on the text. use just the one that looks nice enough)
The border is ok.
Good luck ^^