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A few things: it is a factor since images are seo-indexable (not background elements though so don’t bother with those) but as far as moving the needle – meh.
I do get some traffic directly from images, but it’s nothing crazy.
The bigger thing though that WILL have a big effect on your SEO is optimizing your images and if he’s not experienced enough to drop in simple alt images – I doubt he’s concerned about file formatting, compression, and image sizes.
Without optimizing your images, depending on how many you have in a given page (which seems like it may be a lot by saying how much work your considering for alt image tags, etc.) you are probably slowing the hell out of your load speed which can have a dramatic effect on how search engines rank you.
Since you’re on WordPress, there are plug-ins yo handle all of that, along with the alt tags, but that will usually bloat your site and cost you some cash as most of those plug-ins offer some small amount free and then charge for additional credits.
I suggest getting photoshop and just learning how to properly size and export your images which will give you the chance to change the file names and alt image tags when you import.
I suggest creating AVIFs with WebP as a fallback. If you’re using any jpeg or png – you’re doing it wrong.
