Step 1: Camera Settings, and Photographing the Sculpture.
From everything I read about 123D Catch, it was crtical to have your camera settings consistent.
I set my camera ISO to 100, and shot aperture priortiy, with a +1 exposure compesation, at F/16.
I swept around the sculpture, in a counter clockwise motion, photographing it from as many angles as I could. I eneded up with about 30 usable shots to make the model from.