Permission Issues and Art theft: It's sadly a common thing now.
It is a huge problem on deviantART/ internetz.
But wait! IDK what art theft is..Then Read this!
Art theft is unacceptable. Think about how long people spend on their works. And how much of themselves go into it. Now someone else has spent 0 seconds and claimed it as theirs. NO.
You must credit resources. That includes OCs, stocks, brushes, textures, snippets of code(no, changing the colors of a journal skin does not mean you made it) , tutorials(sometimes).
Written credits. Google images is not good enough.
Read these FAQs.
Can I use the works which I find on deviantAR