Photo retouching is an important job that doesn't get the credit it deserves. Today, basic things like color correction, lens adjustments and red-eye removal may happen inside the camera before a human retoucher even sees the image. However, retouchers and photographers are equally necessary on many projects, especially when the finished artwork is "made in the darkroom."
Almost every photo needs some kind of exposure or color adjustment to look its best. The difference between before-and-after photos can literally look like night and day.