Checklist For ISO Image Search Engine Optimization

* Image Naming:
o Use a meaningful name rather than 'DC00001.jpg'
o Separate words with a hyphen and try not to use too many hyphens. i.e. green-tree.jpg is better than green_tree.jpg, greentree.jpg or DC00001.jpg.

* alt Attribute
o Provide a small description of image in alt attribute of img tag.
o As a good practice do not leave alt attribute empty, provide at least one word.
o Do not fill the alt attribute with lots of keywords, even if they are relevant.

* Text Around The Image
o Place some text around the image that describes it.

* Image Quality
o Try to use high resolution images.
o If available, provide different resolutions of images

* Image Accessibility
o Make sure that the directory that contains your images is fully accessible by crawlers.