The proportion of linguistic devices and expressivity in publicistic style are high. Objectivity, neutrality, and respecting ethical rules and principles of journalism are essential conditions for a journalist. Expressivity and evaluation contained in texts enable a journalist to influence the recipient and reflect the character of the author´s thoughts. *Please keep in mind that these are corrected in American English. I wasn't 100% certain what you meant by "ways of expressivity in publicistic style." Neither expressivity nor publicistic are English words. Perhaps you mean "expressiveness in a publication."