Welcome!
You can place the image anywhere in the profile. To code it you need a URL link though. The coding for that would be [img]IMAGE LINK HERE[/img]
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Eckhart has already linked our art rules but to answer your other question you are more than welcome to use the same image as someone else as long as it's properly cited.
If you have any other questions, please don't hesitate to ask. We're a friendly bunch and eager to assist.
Happy writing!
GoblinFae