{% if page.has_images? %}
  <div class="slick-carousel">
    {% for img in page.images %}
    <div>
      
      
      <div class="thumbnail"> 
        <img alt="{{ img.title }}" src="{{ img.thumb_src }}" >
      </diV>
      <!-- <h3>{{ img.title }}</h3>
       <p>
        {{ img.description }}
      </p> -->
        
    </div>
    {% endfor %}
  </div>
{% endif %}​

Fix indentation & formatting. Remove unused image description.
{% if page.has_images? %}
  <div class="slick-carousel">
    {% for img in page.images %}
      <div>       
        <div class="thumbnail"> 
          <img alt="{{ img.title }}" src="{{ img.thumb_src }}" >
        </diV>
        <h3>{{ img.title }}</h3>          
      </div>
    {% endfor %}
  </div>
{% endif %}​