#1: Better support for those shelves. Poor things are bowing like crazy.
This. You could probably get away with screwing a 2X2 into the existing supports and shelving and that would take care of the bowing issue.
The only other thing is the room looks like it's a bit small, so make sure you take full advantage of your vertical space. The shelves you have there now look like they are pretty tall, so as long as your next set are about the same height you should be okay.