Moving art can be a stressful task. For one thing, it's special. It can be expensive and it usually has some sentimental value. For another, it often includes glass, and nobody wants nicks in their frames. The best thing to do is to wrap each frame in bubble wrap or newspaper and then tape cardboard box pieces to each side to protect it. A group of wrapped frames can then be put into one box together for easy carrying.
If you're packing sculptures, you'll need a box one-third larger than your piece of art. Wrap the sculpture in bubble wrap and/or newspaper. Be sure the box is packed tight with stuffing. That should protect the sculpture.