A: Most C-level execs are primarily interested in increasing sales and decreasing costs. Therefore, whatever you present to them needs to speak to one or both of those interests. Try this two-step approach:
1. Mock up a couple of catalog spreads done the way you think they should look. Point out the advantages of your new look. For example: "Enlarging this best-seller's product image grabs attention, making viewers more likely to stop and look at the rest of products on the spread" or "See how this revised layout helps the eye to flow through the spread, seeing all the products, whereas in this old layout, product X and Y are getting visually lost.". And more...