How can I check that designers' work is 100% original?

You should take the following steps to ensure a design is based on 100% original work and doesn’t incorporate any clipart, stock imagery or, in the case of logo contests, licensed fonts:

• First, ask the designer. Designers must declare any non-original work used, or risk account suspension.
• Try a reverse image search engine such as TinEye. This will look for similar images on the web. You can also upload the image to Google’s image search.
• If you’re running a contest, listen to the other designers participating in your contest — they’re the experts, and can often spot a plagiarized design in moments.

• How do I award a winner?
• Can I ask for changes after I've picked a winner?
• What file formats the winner will provide?
• How long do I have to pick a winner?
• Can I award more than one winner?
• How do I get my design files?
• How do I get a refund for my contest?