All these qualities can be combined but only one of them should be dominant and to someone looking at the picture there should never be a question as to why the picture was taken. When you use good composition and this is very important in landscapes you are simply bringing together things in an orderly and symmetrical arrangement. If you will notice on perhaps older pictures that even you yourself have taken three is usually enough material for two or more complete pictures crowded into one so that the eye wanders when looking at the picture. In other words you have included too much within the confines of one picture. Selection of the picture is the first task to accomplish.
Simplicity is the basic of artistic work.
Try to have one dominant subject, object of one principal interest. Strive to combine the masses, tones and lines to produce a pleasing general effect. Try not to divide the picture into horizontal or vertical lines making two equal parts. Try taking pictures in the early morning or late afternoons to provide the best opportunities for taking your pictures. Some people believe that landscape pictures are not as interesting as ones with people are in them, but that is an individual preference.