Does using an img title attribute in addition to the alt attribute help image SEO?

There is no use of title for image in terms of SEO. It is only used for providing extra information for that image element.

You can increase the SEO by adding ALT tag to your Images.

The image title does not have any effect on SEO but the image alt attribute has a potential SEO benefit.

Google’s article about images has a heading “Use descriptive alt text”. This is no coincidence because Google places a relatively high value on alt text to determine not only what is on the image but also how it relates to the surrounding text.

When I experimented with Google Image search (many years ago now), I found that this markup is what caused Google to most associate the text with the image:

<div>
    <image src="./cat.jpg">
    Funny Cat
</div>

Putting text inside a container div with the image was more effective than either the alt attribute, the title attribute, or the combination of the two.

For image SEO, it doesn't hurt to duplicate the text into the alt and/or title but it doesn't help rankings.

<div>
    <image src="./cat.jpg" alt="Funny Cat" title="Funny Cat">
    Funny Cat
</div>

However, putting the text both in the alt tag and next to the image duplicates the text and hurts usability when the image doesn't show up.