Am I allowed to put the art I downloaded from here on other websites?
Redistributing Artwork
All artwork, photography and literature displayed on deviantART is copyrighted to the artist that submitted it, and therefore, if you desire to redistribute the art you will need to contact each individual artist that you are interested in distributing art from, and gain their expressed and written permission to do so.
Direct Reuse With Explicit Permission
Direct reuse of another artist's work is permissible only when you can provide written and verifiable proof that you have been given permission to reuse that piece in the manner you intend to. Explicit permission is a statement made directly to you by the legal owner of the work in question granting you permission to use the work in a particular manner.
An open statement in an anime artbook, for example, that gives anyone who purchase it the permission to use its contents in fanart is implicit permission, and does not satisfy deviantART's copyright and plagarism policy.
An example of valid explicit permission would be asking an artist via email if you may make a wallpaper featuring some of the artwork he or she has presented in brick & mortar art galleries, and that he or she has displayed on his or her website. If he or she replies granting you permission, please follow our official guidelines for providing this written permission for staff verification.