What was one of the techniques leonardo used to create the illusion that the mona lisa was a real person

Look at las meninas by diego velasquez. this painting is a masterful example of the use of:

Which function of nonverbal communication is at work? trey was planning a surprise party for lynn, but when she asked him why they couldn't go out on friday, trey shifted his eyes, coughed, and stuttered when he said he already had plans. what did trey's nonverbal communication do for lynn? clarify the relationship regulate the interaction increase persuasive power reveal discrepancies manage impressions

David is preparing a presentation on art history. complete the sentence to david describe a significant change in christian art