I have added more functionality to the image SEO tool.
The tool now checks, displays and warns about two other ALT attributes.
Dimensions (height / width) are specifically mentioned by the Google image guidelines. Of dimensions they state:
“Specify a width and height for all images.”
So the tool now displays the width and height if it is there, and if it is not there it displays a warning.
I also now have the tool look for a “title” attribute. If one is there, the tool will display it, and if not, it will display a warning.
Give it a look: Image SEO Tool
Here is a screen shot: