Page uses JavaScript to put big image. But lxml/beautifulsoup can't run JavaScript.

With lxml/beautifulsoup you can get only small images on left side using xpath '//div[@id="altImages"]//img/@src'.

Some urls you can find in one of <script> tag.

Code finds <script> with data["colorImages"] = and data as JSON string which it converts to Python's dictionary - and then it is easy to get urls to images in many different sizes.