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(edited by Sarandi.5860)
We want to use this image for our book cover.
Yes, there will be a problem since it’s a screenshot from the game. If you’re planning on selling that book, it’s a commercial use for it, and generally companies don’t like their content being used freely to make money for other people. Anet is very strict about their policies, and they won’t allow using their property for other people’s commercial use.
My suggestion is hiring an artist to draw the cover for you, and you can give them the screenshot as a reference (don’t make them copy it exactly, just tell them that you’d like something with a similar pose/character/background). If you’re planning on getting the book published through a publisher, they usually have contacts for several good artists. If you’re self-publishing, you can look through art pages, for example http://www.deviantart.com, for any artists that you like the style of, then see if they have open commissions.
It’s always a good idea to commission a good artist to do the cover. Most people pick up a book based on how interesting the cover looks, and only afterwards read the back. If the art on the cover is awesome they might buy it rather than something that has a less interesting cover.
I actually do commissions, maybe I can help you