The hardware you use depends on the weight of the picture and the type of wall which could be drywall plaster concrete or masonry.
How to hang a picture away from the wall.
Measure from the center outside edge of the picture at least 4 inches to the right or left of the picture to determine the best placement for the sconce.
If you re hanging a super heavy piece first use a.
Use fishing line as the hanging wire.
Screw a framing eye hook into each of two marked location on the frame.
All you need to do is make sure you tie a good knot at the ends and you should be good to go.
They come in different tensile strengths.
Not sure if you have drywall or plaster.
Measure the distance between each mark.
Orientate the hook so.
If it goes in it s drywall.
How to keep heavy paintings flush against the wall.
Mark with a pencil on the wall.
Measure from the top of the picture to the hanging hardware.
Take your picture down from the wall and flip it over so that the back is facing upwards.
Hook a measuring tape onto the hanging wire and pull it taut so the wire stretches up toward the top of the frame.
Measure that difference from your mid point mark on the wall that s where the nail or picture hanger or wall anchor or brick clamp goes.
This may look a little complicated but it is do able.
Mark each side of the frame one quarter of the way down from the top corners.
Push a pin in the wall.
If you want to use hooks and wires and you want to hang pictures close to the wall without undue stress on the wire or frame i suggest using two hooks and 45 wire angles as illustrated in the diagram at right.