lucy24 - 3:30 am on Jan 22, 2013 (gmt 0)
content around image
Can't stress this enough. For example: If you've got a picture of a widget within spitting distance of a text link to the foobars page, Image Search will think you've got a picture of a foobar-- even if the picture is called widget.jpg and the alt says "oversized blue widget". You may need to tweak things to ensure the picture also comes up in image searches for widgets.
This is probably intentional and not a bad idea overall ("If the picture is called 'stockticker.jpg' how come all the surrounding text is about your escort service?" or possibly vice versa), but it can still be exasperating.