• Navigate to the appropriate gallery (for instance, a picture of Bizarro would go in Villains/B/Bizarro)
• At the bottom of the page, click on the drop-down menu and select "Add Items"
• Upload your image (make sure the image file has a logical, descriptive name like "Bizarro by Byrne" 
• Wait for the image to be approved & added by an admin  

That's it! I'm not setting an upload limit at this time, but please don't add hundreds of images, as I won't be able to add them quickly. And make sure that the quality of your uploads is worthy of Heroic Images! In other words (here comes another list):

• No watermarks or web addresses on the pics 
• No scanned comic pages filled with word balloons 
• Don't upload a bunch of DC's covers - unless there's a particular one that's missing from the site
• Nothing naughty or graphic (think PG... maybe PG-13)

So let's see what Heroic Images! you've got up your sleeves. Help us build the largest, highest-quality DC Comics image gallery on the 'net!