It's not a case of
needing to, but it's advisable. I'd ask the "
SEO expert" what he plans to populate these title and alt attributes with. If each one is going to use keywords,
don't. Only use them where necessary. The alt attribute should describe what the image is about. If a keyword can be used naturally here, go for it. However, the alt attribute has little
SEO value unless the image is a link, in which case it acts as anchor text.