Zoom in close to see your work better. By going to View > New Window, you can have two windows open for the same image. Set one to actual pixels and then zoom in on the other. As you work on the zoomed window, you can see your results at actual pixels in the other window.
Continue cloning until all the ink spots are cleaned up. Remember, undo is your friend (Ctrl-Z). The hardest part of the image to correct is going to be the girls face, but if you work slowly and carefully, you can make considerable improvement.
