When I send estimates to clients, I always do a line item of the services and include one that says "post-processing." I usually have to explain what this means, since most people always assume that things come out perfect from the camera (dont' I wish!). Here's an example.
The original is a pretty good photo.
But it could always be made better with some post. Here I cropped in a little more to bring the focus in. I also darkened the sky, removed the telephone post in the background and added some snap to the overall image. I also burned the edges in a bit to keep the viewers eye in the middle of the photo.