Wall Picture Frames are in nearly every house, but are actually less common to be bought cheaply in stores compared to their table or sideboard mounted counterparts.
Wall mounted picture frames tend to be larger than other cheap picture frames as they make up more of the general look of the room rather than something where you stop and study them. One of the key issues when having picture frames on your wall is to make sure that they are straight.
You can take a look at this video which shows how to properly hang wall picture frames on your wall.
Take a step back and see how it looks. It’s best to ask a friend to help as you can kind of get blind to seeing the subtle differences when hanging a picture frame after a while.