This is a supplement to Ikemarth's post on catching thieves. In her post, she described how you can find your art by Googling your username in an image search. Well, I've found something similar that is equally useful: Google the image itself!
Now, you're probably thinking, "How can I use an image as a search term?" Well, my friend, that's why I've made this post. The process is actually pretty easy.
Open up two new tabs: one for Google and one for a piece of your art here on theO. Right-click (the Mac equivalent is Ctrl+click) on the image and select "Copy Image URL" from the menu. Switch to the Google tab and paste the image URL where you would normally type in a search. Click the little magnifying glass icon. Google will then ask you if you want to search by image. Click the words "search by image". From there, a bunch of similar (but hopefully not identical) images will pop up.
But wait! There's more! You can type in words that describe your image, too. Just type it into the search bar next to the tiny icon of your image.
This is a good way to find out if someone's been either (a) stealing your art or (b) posting other people's art. It's another thief-catching tool to add to your bag of tricks.