Be careful with large graphics!
Remember 60K recommendation
Use the alt attribute to supply descriptive alternate text
Be sure your message gets across even if images are not displayed.
If using images for navigation provide plain text links at the bottom of the page.
Use animation only if it makes the page more effective and provide a text description.
Choose colors on the web palette if consistency across older Windows/Mac platforms is needed
Use anti-aliased text in images
Use only necessary images
Reuse images
Goal: image file size should be as small as possible