TinEye is a great reverse image search online service, that can tell you where an image came from, find different sizes of the image and you can find out if someone is using your image without your permission.
Sometimes it takes time for Google to crawl and index your website pages but until then they won't appear in the Google search results. But there's a way to speed up the indexing process.
If you experience an Mac OS X program to freeze and you cannot exit it by clicking quit or using a keyboard shortcut, you can always force it to quit using the Activity Monitor.
