If you want to customize your visitors’ experience, when visiting your website you would probably want to draw an icon. If so add this line inside <head></head> tags on every page of your website.
Add this line between head tags:
<link rel=”shortcut icon” href=”http://yoursite.com/favicon.ico” type=”image/x-icon” />
For drawing a favicon i would probably recommend this site: Favicon.cc. Or use Adobe Photoshop.
If you would like to create your favicon.ico from the image the best solution would be: this solution.