US World News Today: OPTIMIZE IMAGES: HOW AND WHY DO YOU OPTIMIZE IMAGES OF YOUR WEBSITES OR BLOGSPOTS FOR SEARCH ENGINES, SOCIAL MEDIAS, LIKE PAGES AS WELL AS THE CROWD?

OPTIMIZE IMAGES: HOW AND WHY DO YOU OPTIMIZE IMAGES OF YOUR WEBSITES OR BLOGSPOTS FOR SEARCH ENGINES, SOCIAL MEDIAS, LIKE PAGES AS WELL AS THE CROWD?

Using Keywords in alt text, text around the image, image name, page title;
Preferring image formatting – jpg;
Separating SE accessible image folder;
Image freshness. (SEW suggests re-uploading your images and keeping them fresh);
Enabling image search option at Google webmaster tool.
Reasonabling image file size (see the discussion at WW)
Keeping Limited number of images per page;
Sharing hosting Popular and reliable photo (e.g. Flickr is reported to help in Yahoo! image optimization).

(obvious) using really great images to give your readers another reason to spread the word;
( getting Digg thumbnailed submission) stick to jpg format and making sure the images can be resized to (or already are) 160×120 or 160×160 pixels (Unless you have an image that can be resized that way Digg will not offer the submitter a thumbnail to go with the post).

People's attention are paid to a clear image where they can see details (choose high quality images).
(Clean, clear) faces in an image get more eye fixation. (avoid using abstract images too often).
Keep them relevant: images are not the first thing a visitor sees on a web page but they can compel him to stay (according to the eye-tracking research web text is prior to images; when looking at a printed article people see images first; with web page they see text first – nevertheless images make the visitor stay and remember the page via relevant associations).

women are better at recognizing facial emotions than men (research):
men seem to be more likely than women to first look at faces rather than other parts of a nude body (source);
women are more interested in images with more than one person (source).