Is it okay to say: "We are too concerned with our appearances?'<br/>And also: "People care too much about their appearances."<br/><br/><a href='http://www.oxfordlearnersdictionaries.com/definition/english/appearance' target='_blank' rel='nofollow'>http://www.oxfordlearnersdictionaries.com/definition/english/appearance</a><br/><br/>This states the appearance can be plural or singular (countable or uncountable).