Avoid using large images
One way to ensure people abandon your website is by having images that are too large and take too long to load. As far as your images go, anything greater than 72 pixel resolution is unnecessary and will require too much time to load. An image file that is too large can be cumbersome on a broadband connection, imagine how slow it would be on dial-up.
Pictures improve the image of your website and they look good to the search engines too. You should use relevant images on your site whenever possible, as long as you use them in such a way that they load quickly and efficiently.