Wow that Buneary is fantastic!!! To add a background, it depends. If the Buneary is all on one layer with a transparent background, adding a background will be easy. If not, you're sort of screwed just a little bit. If it's not on a transparent layer, add a layer beneath Buneary. Go back to the Buneary layer and select the Magic Wand tool and click on any part of the white background. You'll see something at the top that says Tolerance. Play around with that if the selection isn't as refined as you'd like it to be. Then click Edit and Cut and the white will vanish. After that, you can draw whatever you want to put in the background on the layer beneath Buneary without messing it up. Good luck d00d.