My code finds 'smiley faces' in arrays, but it won't pass all the tests. Can you see why some tests fail?

-Each smiley face must contain a valid pair of eyes. Eyes can be marked as : or ;
-A smiley face can have a nose but it does not have to. Valid characters for a nose are - or ~
-Every smiling face must have a smiling mouth that should be marked with either ) or D.
No additional characters are allowed except for those mentioned.
Valid smiley face examples:
:) :D ;-D :~)
Invalid smiley faces:
;( :> :} :] 

//var arr = []; //should equal 0, and does equal 0

//var arr = [':)',':(',':D',':O',':;']; //should equal 2, BUT equals 5

//var arr = [':D',':~)',';~D',':)'] //should equal 4, and does equal 4

//var arr = [';]', ':[', ';*', ':$', ';-D'] //should equal 1 , BUT equals 3

var count = 0;

function countSmileys(arr) {

  for ( i = 0; i < arr.length; i++) {

    var testSmile = arr[i];

    //if string length is 2...
    if ( testSmile.length === 2 ) {
      //check that it's a valid smiley 
      if ( testSmile.charAt(0) === ':' || testSmile.charAt(0) === ';' 
      && testSmile.charAt(1) === ')' || testSmile.charAt(1) === 'D' ) {

        count++;

      }

    }

    //if string length is 3...
    if ( testSmile.length === 3 ) {
      //check that it's a valid smiley 
      if ( testSmile.charAt(0) === ':' || testSmile.charAt(0) === ';' 
      && testSmile.charAt(1) === '-' || testSmile.charAt(1) === '~' 
      && testSmile.charAt(2) === ')' || testSmile.charAt(2) === 'D' ) {

        count++;

      }

    }
    //if the array is empty, return 0 - another requirement of the challenge
    if ( arr.length === 0 ) {

      count = 0;

    }

  } //close for loop

  return count;

} //close function

countSmileys(arr);