Web Graphics and Photo ResourcesFinding graphics can be a problem for any webmaster. Fortunately, there is plenty of clip art and web graphics websites and software packages. There are also artists online that offer graphic and clip art for a fee. You might try a web search to find an artist. Flickr also has a wide variety of photos -- some of which can be used by giving the photographer an attribution.
If you want to make your own graphics, Adobe has some great general advice is an article about creating web graphics using Illustrator.
Here are some resources that provide web graphics and clip art. Be sure to carefully read the terms before you use any art, pictures or photos you find online.
A1 Icon Archive
Animated Gif Artists Guild
Clip Art Connection
The Free Site -- Webmaster Freebies
Gfycat - find and create animated GIfs
Giphy - a great source for embeddable animated gifs
The Internet EYE Magazine
Leo's Icon Archive
w3schools: HTML Graphics - describes how to create graphics with SVG and Canvas HTML elements.