Nothing more than gaining attention. In fact, that is the scope of every ad. According to UX experts, well designed pictures ( cover photos, banners etc ) are very effective in grabbing attention. Users tend to remember their content than plan text based ads.
Images get more attention than text. It is good for UX in general. That is one reason why infographics are gaining popularity these days.
Last edited by Jim Gillum; 05-19-2018 at 04:17 AM..