File> Place

Quick Mask Mode + Eraser Tool
After that is done, as usual I wanted to add a few effects to my image, so I went to Levels to do so.

Image> Levels

After Levels
Well, after placing the last picture, I felt like adding more things to my wallpaper as it looks a bit plain at some part. So I chose to add some wishes to my wallpaper. I first clicked the Type Tool, then type out the wishes that I want with the font of Nueva Std and size to 30pt.

Type Tool to type out the wishes
Next, I put some effects to the words by going to Blending options> Drop Shadow & Color Overlay.

Blending options> Drop Shadow
Color Overlay
Finally, I adjusted the position of everything a little bit more and my wallpaper is now FINISH!! :] Remember to save it after everything is done.
The Finish Wallpaper~ :]