Pictures no longer being found on Google Image Search - what happened?

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I have a web site that contains a few pictures (jpg's). Their titles
contain my name. Until recently if my name was entered into a Google
Image Search (, Google
would indeed find those pictures and display them.

Well, one of those pictures did not have my name in its title, so I
changed the title to include my name so that it, too, would be found.
Shortly after that change, Google Image Search stopped finding *any*
of my pics.

If one runs a test on my site - "site:mydomain .jpg"  without the
quotes - it finds a couple of pics there, but none that include my
name in the title.

Why did Google Image Search stop finding my jpg's, and what can I do
to make it start finding them again?

Thanks very much for all suggestions.

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