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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
I think that a site can look good with no images if it's a little blog or a personal website however when it is something like HVAC or an industrial service type company images should be used to convey the message of what they do. Otherwise, a user may be confused about what the websites is about or it would make the site look like it was built on a hosts 'site builder'.