Image ranking is overrated.
Whaaa?? it's sure not overrated when you get ur image on a featured snippet. Image ranking helps me target hard keywords by using charts, diagrams, infographics, ect google eats it up IMHO.
The trick is to host your own images (not from a weak CDN subdomain, but your main domain), make sure they're unique (rotate 15 degrees and slightly alter exposure if ur reusing product images) and then give them of course the basic image SEO - descriptive file names, alt & title tags.
Best snippets include images, I absolutely agree.
Do you know any services that can do slight image editing in bulk - like spinners but for images? There must be a service like that but who knows.
are there any in the web? even paid ones? that would've been so convenientI use darktable https://www.darktable.org/ it's free and open source. Just import a bunch of images, apply the rotation and adjustment on one and you can copy and paste that style to all the images you have.