Basically what I meant was whatever your personal thoughts on what a completetly finished piece of artwork is to you. If that means re-doing it due to the paper chosen cannot handle water colours, and you wish to water-colour it, then do as such. If it means inking, then ink it. If you wish to colour it with pencil, then do it - and even Crayola coloured pencils will work; that's what I used for my Carbuncle drawing, and it seemed to work out fine. If it only demands cleaning it up and adding shading, then do such a thing. Really, it's always subjective, and as such, I would want you to be the one for deciding if it's done or not.

Personally, I can see it finished with whatever path you chose, whether that be water colour, pencil, ink, or simple pencil shading. It simply needs refining and cleaning, and then you take it from there.