shows the default image when image is available in database

i need to show the image displayed in database but it shows default image

  <?php
      $link = new PDO("mysql:host=localhost;dbname=campusdrive", "root", "");
      $link->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
      $Sql = "SELECT Image FROM student_form WHERE Sessionid = :Sessionid";
      $stmt = $link->prepare($Sql);
      $stmt->bindParam(":Sessionid", $sessionid, PDO::PARAM_STR);
      $sessionid = session_id();
      $stmt->execute();
      $count = $stmt->fetchAll();
      if($users = $stmt->fetchColumn()){         
      echo '<img src="data:image; base64,'.base64_encode($count['Image']).'" style="margin-top: 100px;width: 100px; height: 100px; border-radius: 50px;">';
      } else {
      echo '<i class="fa fa-user-circle" style="font-size: 50px;"></i>';
      }
  ?>