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My client is building a new shopping cart that will be mobile friendly BUT will have terrible image quality - tiny images, with text on them. How will these tiny images impact the SEO on the main site? Should they put the store on the mainsite.com or on a subdomain (store.mainsite.com)? Does google see subdomains as part of the main site? I would think that having thousands of shopping product pages could be beneficial to the main site SEO, as long as the images don't negate the content. Thoughts?

I have a client that has a HUGE website with thousands of product pages. We don't currently have a sitemap.xml because it would take so much power to map the sitemap. I have thought about creating a sitemap for the key pages on the website - but didn't want to hurt the SEO on the thousands of product pages. If you have a sitemap.xml that only has some of the pages on your site - will it negatively impact the other pages, that Google has indexed - but are not listed on the sitemap.xml.

My client currently has a main website on a url and an eCommerce site on a subdomain. The eCommerce site is currently not mobile friendly, has images that are too small and are problematic - and I believe it negates some of the SEO work we do for them. I had to turn off Google Shopping ads because the quality score was so low. That being said, they are rebuilding a shopping cart on a new platform that will be mobile friendly BUT the images are going to be tiny until they slowly replace images over several months. Would you keep the shopping cart on a subdomain, or make it part of the main website URL? Can it negatively impact the progress we have made on the main site SEO.