The HTML title attribute is not necessary for images. On some desktop browsers it will give you a mouse over tooltip effect. Most of the reputable SEO folks agree that title would be ignored be search engines.
The physical file name, and the
alt tag are used and impact your page rankings.
alt Tag is required, and should describe the image well enough, that if the image failed to load, the user would understand what was going to have been there.
In the early days of the Internet most people used slow dialup connections and often had their browsers configured not to load images. Today screen readers will read the alternative description out loud.
So you example of
Would be better if more descriptive
A black cat jumps over the moon
You don’t need to say image or give the file name in the