What is a good advertisement? An advertisement which pleases you because of its style, or an advertisement which sells the most? They are seldom the same.
David OgilvyThe headline is the most important element in most advertisements. It is the telegram which decides the reader whether to read the copy.
David OgilvyMost headlines are set too big to be legible in the magazines or newspaper. Never approve a layout until you have seen it pasted into the magazine or newspaper for which it was destined. If you pin up the layouts on a bulletin board and appraise them from fifteen feet, you will produce posters.
David Ogilvy