Any sort of Middle Earth legendarium artwork is ok. It doesn't need to be made by or about hobbits.
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The five armies are goblins, eagles, dwarves, elves, and men. Beorne doesn't count as an army, although it might take one to kill him. Sand worms don't count either because they are from Dune.
Note that Beorne is rescuing Thorin.
Thank you for clarifying about the sand worms