Images and graphics are useful tools for making a page look interesting, to illustrate points, and for design reasons such as breaking up large amounts of text.
However, you need to be sure that images you do use are of sufficient quality to add something to the page. You also need to be sure that their use is thought about carefully to make sure customers with accessibility issues aren’t disadvantaged if they can’t see them.
Is the picture strictly necessary?
It might seem desirable to illustrate a page about farming and agriculture with a picture of a tractor, but how does this help the understanding of the customer?
Is it the right size?
Pictures that are much bigger than the amount of text on the page make the content difficult to read. Too many pictures also draw the eye away from important information, reduce the visual effect of including them at all, and makes pages crowded and messy.
Less is frequently more!