Google indexed my 282,000 image pages at 
http://www.painetworks.com/indicies.html
about 2 months ago. After one week they appeared on Google's Web
Search Engine. However, as yet, they have not appeared on google's
Images search Engine. This is the site I wished them to appear on
because the pages each have a unique image.
Is there a special URL to request indexing of sites for Images only? I
used  http://images.google.com/addurl.html
to index. Is there a separate one for images. If not, what are the
special requirements to have images indexed?

Best regards,

mark

Hello Mark,

Unfortunately, there is no separate facility for requesting to be
added to Google's Image Search.  Google's Image Search crawler is
completely automatic, and Google makes no guarantees as to when - or
even if - your content will be indexed.

The Image crawler seems to be quite a lot slower than the usual
Googlebot.  The Googlebot has indexed  3,307,998,701 web pages, but
there are only just over 425,000 images included in the Image Search:

"You can search more than 425 million images on the Web with Google's
Image Search. However, there are many more images on the Internet that
Google has not yet added to its index. Google is working to crawl more
images to increase the quality and quantity of images returned when
you search, so it's likely we will add the image you're looking for in
the near future."

An image I know is online wasn't found when I did my search. Why?
://www.google.com/help/faq_images.html#why

You can help entice the Image indexer to pick up your content by
ensuring that your page names, file names, captions and ALT text are
as descriptive as possible.  I did a spot check, and found that your
file names aren't descriptive at all - this may very well be what's
standing in your way.

Consider:

Image ID: 090010.JPG
http://www.painetworks.com/pages/09/090010.html

Your ALT text is full of descriptive information and keywords.  In
fact, it's identical to your caption.  There is nothing in the page
name or file name (two of the factors the Image indexer will look at)
to tell users (or the Indexer) what that image is, though.

Now look at what happens when I search Google Images for "earthquake":

Image Search Results - earthquake
http://images.google.com/images?q=earthquake

In 35 pages of results, the vast majority have "earthquake" in the
file name, the page name, or both.

Your keys here are as much descriptive information as possible, in
every place you can manage it (page and file names, captions, ALT text
and links to the images/pages) and patience -  again, Google makes no
guarantees as to when or if our content will be added to the index. 
Give the indexer a bit more information to work with, and you may find
it in there sooner rather than later.

Good luck!

--Missy

Search terms:  None.  Pulled up Image Search Help

very concise explanation