How can I fetch and edit avatar image alt tag on generating users list fields some like this:

class FOLLOWLIST_UserList extends BASE_CMP_Users
{
    public function __construct( array $list, $itemCount, $usersOnPage, $showOnline = true)
    {
        parent::__construct($list, $itemCount, $usersOnPage, $showOnline);
    }

    public function getFields( $userIdList )
    {
        $fields = array();

        $qs = array();

        $qBdate = BOL_QuestionService::getInstance()->findQuestionByName('birthdate');

        if ( $qBdate !== null && $qBdate->onView )
            $qs[] = 'birthdate';

        $qSex = BOL_QuestionService::getInstance()->findQuestionByName('sex');

        if ( $qSex !== null && $qSex->onView )
            $qs[] = 'sex';

        $questionList = BOL_QuestionService::getInstance()->getQuestionData($userIdList, $qs);

        foreach ( $questionList as $uid => $question )
        {

            $fields[$uid] = array();

            $age = '';

            if ( !empty($question['birthdate']) )
            {
                $date = UTIL_DateTime::parseDate($question['birthdate'], UTIL_DateTime::MYSQL_DATETIME_DATE_FORMAT);

                $age = UTIL_DateTime::getAge($date['year'], $date['month'], $date['day']);
            }

            $sexValue = '';
            if ( !empty($question['sex']) )
            {
                $sex = $question['sex'];

                for ( $i = 0; $i < 31; $i++ )
                {
                    $val = pow(2, $i);
                    if ( (int) $sex & $val )
                    {
                        $sexValue .= BOL_QuestionService::getInstance()->getQuestionValueLang('sex', $val) . ', ';
                    }
                }

                if ( !empty($sexValue) )
                {
                    $sexValue = substr($sexValue, 0, -2);
                }
            }

            if ( !empty($sexValue) && !empty($age) )
            {
                $fields[$uid][] = array(
                    'label' => '',
                    'value' => $sexValue . ' ' . $age
                );
            }
        }

        return $fields;
    }
}

some how I need to incorporate this:

$avatars = BOL_AvatarService::getInstance()->getDataForUserAvatars($userIdList);
        foreach ( $avatars as $userId => $avatarData )
            {
                $displayNameList[$userId] = "test".isset($avatarData['title']) ? $avatarData['title'] : ''."";
            }