You can all have your own opinions on black outlines, but I honestly don't care.* Ptoing's edit is unfair because I could transplant the figure from The Scream onto a cel-shaded background and it would look ridiculous. That's not to say that there's no merit to cel-shading (or black outlines), it's just that they don't always merge well with other techniques. If I didn't intend to add a background the black outline would stay because I like the way it looks. I am planning a background so it goes.
* = I do, but not enough where my topic is taken over by its discussion.