The average person’s line of sight is 60" above the ground, so I recommend that you hang the art at eye level. 

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If you are hanging art above a couch hang it about 6"-8" from the top of the couch.

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Hanging Art on Wall

For large pieces I use 2 Command Strip Hooks about 3-4" apart. This keeps your art from shifting and hanging crooked. 

You can to the same with 2 nails. 

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Here is a great video from HGTV