People often design ads to look clever or cute or creative. The three c's of failure. Instead, describe your product or service in terms that serve your reader. That ad served me by informing me. Your prospects buy from you because of what your product or service gives them.
People justify their emotional urge to buy something with logic.
Without the facts, your ad is fluff. Prove your product or service delivers by describing the features. Not many words are needed. Just re-read Bedell's principle four. The great ad wizard David Ogilvy said advertising should be allocated in your budget just as any other expense.