Much like DeviantART isn't Google or Photobucket, DeviantART isn't a colouring book. If you see someone's shiny lineart either newly uploaded or in their gallery, don't think "hey, that looks nice, I'll colour it!"

It's not your artwork to take and colour.

By all means, if it's in a club that specialises in lineart that is available for others to colour then, with any appropriate credit required by the artist and / or club, colour it. But if it's someone's own, personal gallery, the only thing you will do is annoy them.

If you really, really want to colour some of their work, drop them a note and ask. The worst they could do is say "sorry, I don't let people colour my artwork". But they might say "yes", or "we could collaborate instead".

But simply taking it, colouring it and uploading it again, whether you credit or not? That's theft.

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Helpful FAQs

FAQ #8: What does deviantART consider to be Art Theft?
FAQ #94: Can I use the images I find on deviantART?
FAQ #157: Can I use things created by other people in my submissions?
FAQ #257: What sort of permission do I need to use someone else's work?
FAQ #306: Does "Crediting" let me use whatever I want?

DeviantART Etiquette Policy
DeviantART Copyright Policy

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I never thought I'd even consider making a stamp for this, but then, I never ever considered that anyone'd actually do this to me!

Note: I Americanised myself briefly and used 'color' instead of 'colour' because, er, the 'u' stopped the word fitting in the stamp properly.

Feel free to link, thumbnail, or whatever the stamp.