As Phineus said, you have to upload pictures to a website first to display pictures on the 'net.
Try a free picture hosting site like
http://www.freepicturehosting.com/
For more such sites use your favorite search engine and search under the phrase "picture hosting".
When you DO get them posted, please don't display so many pictures at one time, as it could make the page very slow to load. 3 or 4 would be fine, while the rest can be just posted as clickable links.
I'm not sure what you mean by headlight sprites, but custom headlight textures have been done for years.....nearly EVERYTHING in MTM2 has been done at one time or another.
There's a collection of custom headlight/tail-light textures around here somewhere (by Alpine I believe). I can't remember if Alpine's site is still around or not. I just make them from scratch myself.