Just think of me as verbal Prozac. Try this formula: Add the dimensions of the width and length of the foyer area together. This number will be the measurement in inches what the width of your fixture should be. Based on the dimensions that you have given me, I think you should be looking at a chandelier that is 55 inches in diameter. The length will be a little bit harder to determine, as it depends on the ceiling height. Taller ceilings can take longer fixtures. Somebody in your family or your contractor could make a mock-up out of wooden dowels and strings to get a feel for what the fixture would look like in the space.