That artists use all of the elements of art and principles of design for their artwork or do they chose certain elements and principles to construct their artwork?

It depends on what the artist is trying to convey. Many just choose certain elements and principles to make his or her point of view easily known to the viewer. Others use all of them to evoke different emotions and ideals into different people. But sometimes art is just meant to be enjoyed, not analysed. Most want to express a deeper meaning in his or her work, but many just want it to be appreciated for the skill and work that went into producing the work.