Yeah. Clone stamp is the basic tool for me as well. Small or narrow areas, especially cell shading (which often needs fixing anyway after cutting out), is just basic brushwork. And of course one can never forget the famous airbrush... But it's basically and fundamentally like Phoenix[numbers] said: Any technique or tool that gets the job done is perfect. That being said, you can't fix images unless you know at least the basics of PS drawing, but that's not hard to learn.

And a Wacom tablet sure made that kind of work much more enjoyable...