I saw you edited the Steven Universe character page recently. I assume it was u who changed the current image back. I was the one who changed it in the first place. I changed it because recently I downloaded the image to an art app on my computer so I could play with it. When was selecting parts of the image to crop out unneeded space I found some pixels were missing or colored wrong. That's why I changed it. I also gave Steven's shield the same colors it has on the gem weapons page.
Contrary to what you may have been told, an image vote is not needed for the navbox images in this case. Don't worry, you're not in trouble, I'm just informing you the vote was cancelled; feel free to change the navbox images any time you're free ^^