Yes, "views" is usually treated as a plural noun. Between "views on" and "vies of", I believe both are possible, but "on" appears to be much more common. Because "on" indicates being on top of or near something (and "relating/pertaining to" in more abstract usages), "views on" sounds like a person's ideas as he or she relates to something now, whereas "views of" gives the impression of a more established and fixed opinions. But it is probably safe to go with "views on" if you have any doubt. For example, - What are your views on this movement? (controversial or ongoing thing - "on" is definitely better) - What are your views on/of art? (long established things or historical people - "of" might work too)