"A picture is worth a thousand words" is a good saying to go by when setting up a website. Studies have shown that most people do not read websites word for word. They mostly scan the writing as they scroll down, trying to find pertinent information.
One way to make that easier for them is to provide images. A well presented picture, with clear reference to the website, and particularly to the commentary near it, could provide more information than a paragraph of text.
A picture should not describe the text, but complement it, in order to encourage the browser to find more information within the text.
But, don't feel that every single page or comment needs a complementary picture. Pictures tend to take longer to download and can distract from the central message.
A simple interior shot of a gallery, store or restaurant can say a lot about the business, and yes, even about the "philosophy" of the owner.
I know, this is a post about pictures, without any pictures! I've covered that too, if you read through the whole post!