I have written about some of the pitfalls with hanging art on canvas in the bathroom before, but that doesn't mean you can't hang other forms of artwork. Here is my response to a recent email inquiry, which I hope will offer some additional clarification:
Q: Could you please advise me what sort of artwork could I hang in my bathroom? I would like to hang a painting or one of those photographs printed (screen-printed?) on canvas-type material (I am not too sure of the material). Please advise. Best regards, S.L.
A: Hi S.L.- Art for the bathroom has some challenges but it is certainly not an impossible dream. If the bathroom has a tub or shower I would stay away from hanging art on canvas or wood panel. Over time, the moisture from the bath or shower steam could cause the canvas stretchers or wood panels to expand and contract, warping the support.
I think artwork on paper, such as my giclee prints, is better suited for bathroom. Your best bet is to have the art framed professionally with mat, glass, and backing paper to seal the art in the framing. That will help to prevent moisture from getting in under the glass.
On the other hand, if you are talking about a half bath without tub or shower, I would think you could feel reasonably secure hanging most any type of art. You may also wish to ask the opinions of a professional picture framer or art conservator in your local area. I am not an art conservator, but offer my opinion based on my own experience with the materials. I hope this helps!