If you mean your own artwork, then you'd take a picture of it, upload it to your computer (make sure you know where you're saving it), then select Insert > Picture in Word, browse in the location where you saved the photo, click the picture, and insert. If you mean an image from the internet or something, you can just save it to your computer and basically follow the rest of the steps above.
I just got a new computer with Windows 10. Naturally, I had to download several "new" programs, Word, Excel, Power Point. I am so upset that they have removed the Clip Art feature from Word. I used this all the time when publishing our community news letter and calendar. I am looking for an easy to use replacement, but so far, no luck. Any suggestions? Thanks.