The approach you take depends on how heavy the picture is. Large artwork should always be anchored to the wall. Small artwork can just hang on a nail.
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How to Hang a Picture

Pictures often come with hangers. The most common types are saw-toothed, wire and D-rings. The saw-toothed hanger is the most typical. Usually attached to the upper middle portion of the picture frame ...
A properly hung picture can really bring a space together, providing visual interest and a finishing touch to otherwise-bare walls. But hanging pictures, whether a gallery wall or just a special ...
Hanging a picture frame so it's perfectly level can be an exercise in trial and error. But it doesn't have to be. Luckily, you can save yourself the frustration and ...