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Hello @joe-g
Premium Version allows to include Featured Images and WooCommerce Product gallery. But both Free and Pro versions collect images from Page/Post Content.
If your images are coming from WooCommerce Gallery, you can purchase Pro Version in order to include those images in your Image Sitemap. On the other hand, if you are using another plugin for Gallery, we can provide you a simple code with a filter to get images from that plugin.
Please let us know if you need a filter for third party plugin. I also found some wc-gallery- CSS classes in your gallery, if those images are coming from WooCommerce Product Gallery, please check our Pro Version features.
Best regards