Design feedback desired

So I've been toying with a new design for the pictures' section of my website. You can compare the two designs:

• Old design
  
• New design
  

Nominally, the content of the two versions is exactly the same, but the layout is different. One big concern I have about the new version is that users with smaller screens may have to scroll horizontally (which is a big pain). Do you have any comments along these lines? How about any suggestions on what I might do to mitigate this problem?

I strove for a cleaner look with equal or better access to the information that was already there. Have I succeeded? What else can use tweaking?