You can host 12 pictures when you use eBay's Picture Service for regular auctions.  For listings on eBay Motors you can list as many as 24. To get more you will have to host your pictures somewhere on the web.  To add as many pictures that you want, put this code in the description box:

                <img src=http://your_URL_image_address>       It will look similiar to this:

                <img src=http://www.boomspeed.com/pak-rat/compote2.jpg>

   Using the same code, with different image addresses, will give you additional pictures; as many as you want.

   Go here to see various ways to place pictures in your auctions' descriptions:

h_ttp://www.boomspeed.com/hpg/PicsInDescription.htm    

 Note: You will have to copy & paste the above URL it in your browser and then remove the underlined space between the "h" and "t" before going to the site.