The Site Name call to action in this screenshot (1) ('Learn more on Wikimedia Commons') is wrapping around to the next line in the Media Viewer light box, which creates visual clutter and throws the page out of balance. This can also happen with other right column labels.
Consider reducing the font size for all lines on the right column, to more closely match the design mockup for this project (2), in order to minimize these wrap-around issues. This could be combined with autoEllipsis, if any of these right hand labels end up being longer than 48 characters (as we are doing with filename and other fields).
More info about Media Viewer on our project page (4).