That's the eternal problem!
And who will have different responses depending on whether these frames are in a stairway, above a base cabinet or a sofa ... or even just on one wall of the living room!
It is clear that the decorator who starts always tends to place his frames too high! Hung too high an art significantly alters visually the proportions of the room in which it is located and the art is then seen in a distorted manner.
In fact, the right level to hang arts will depend almost entirely on the location of the viewer.
>> A general principle ...
The center of the art frame must always be at the eye-height of the viewer! So now everything depends on the beholder, is it standing or sitting on a chair or sofa ?
A little trick thumb : when to be seen standing, hang your frames so that their centers are at 1.55 m (61") in height ... 1.55 m Why?? Because this is the height currently favored by art galleries and museums for their exhibitions : basically this is the average height of the eyes of the spectators.
In doing so, uniformly, throughout the house, you will give some unity to your show, a certain harmony and the viewer will perceive that "harmony of centers" even without realizing it.
For the center of the frame to 1.55 m, here's , without hesitation, how to set "the hanging nail " :

- "Really!"
1 - The frame measures 36cm high ... I divide by 2! Is 18 cm!
2 - I measure the distance from wire to the top of the frame: 6 cm!
3 - I subtract 6 from 18: 18 - 6 = 12cm
4 - add to 155 cm ... I get 155 +12 = 167 cm (approx 66")
By hammering the nail attachment to 167cm from the ground, the center of the frame will be exactly set to the eyes height average !
Use this method for hanging pictures in an entry, a passage, a corridor ... wherever one stands!
>>If you have a horror of calculations ... !
Then you will place your frames without any measure ... DIY in two minutes this awesome instrument that will quickly become indispensable when you hang your frames ...
The material? A 30 cm rule out of transparent plastic, a wood screw ... That's all !
Make a small hole at the bottom of the rule. Screw it in half by letting it overflow on each side of the rule: it's ready!
Pass the tool behind your frame... hook the string or the ring on the head of the screw ... and keep all by the other end of the rule.
Move all on the wall. It's better if you guide someone who move all on the wall!
When your frame is at the right height and at the right place.. press a little harder the rule against the wall ... the tip of the screw then leaves a small mark ...
It's the EXACT place where you have to hammer the frame hook so that it will be at the correct height.
If the explanations are not clear enough ... look at this sketch !