Benefits of image sharing are: 1. Increased search results. 2. Increase click-through rate. 3. Reach people in less time. 4. Make text or information stand out. 5. Humanize your business. 6. Showcase products and/or services.
Tagging photos that you've uploaded to a photo sharing site means your photos will have much better visibility, and will also be likely to generate more user comments and constructive criticism of your work.