I do sitemaps almost only for Google (with cron job) and I belive as many others that
it helps SEO a lot.
Now I see you asked about images....
So...does Sitemap xml have any influence in Google indexing images?
The sitemap is only a tool for Google and others to make it easier to find your stuff. Pages and images get index (or not) with or without a sitemap, once a search engines knows your site is on the web.
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