The following design guidelines assume that you have scanned a drawing into your computer or have located a piece of artwork and imported the image.
Pixabay's description of themselves is pointed and very clear. No technical jargon or fancy words to let you know that they offer free images. Their website says "Finding free images of high quality is a tedious task - due to copyright issues, attribution requirements, or simply the lack of quality. This inspired us to create Pixabay - a repository for stunning public domain pictures. Your source for free vectors, free drawings and free photos. You can use any Pixabay image without attribution in digital and printed form, even for commercial applications."
Typically, you will find volleyball clipart on the Internet offered at various websites. They are usually available for free, and you can use them for anything you like. Perhaps you need some for your personal website about volleyball, or for a presentation you are preparing, or you're just fond of collecting clipart. You can also use such clipart for printing designs for your shirts, volleyball jerseys and posters. Clipart comes in different formats such as still graphic, gif or animated. There are also books and magazines that have pages of volleyball clipart available.