Yes, images are an essential part of any blog or website. If you include any kind of visual, whether images, graphics, or videos, the quality of your pages is enhanced. The reason is that the people are always looking for these. Written material is preferred but if you're trying to explain a process, then it's better to include a few photos and some videos. Too much written material and no images certainly mar the concentration of visitors. This way they are unlikely to visit your pages again. Also, it is wise to bear in mind that including too much visuals may rob the actual messages of your pages. So there's a fine line between some and too much. So do include images and other visuals but don't overdo it in any case.