Thou Shalt Be Unpredictable.
Women absolutely LOVE men they cannot predict. You should always aim to change things up every now and then. Change your hairstyle, your outfit and your cologne regularly to appear varied and unpredictable. Sometimes be finely and sharply dressed, and other times be scruffy. Or be cleanly shaven for awhile, then be unshaven and rugged.
Even change your behavior. One day be really understanding, tender and loving. The next day be cheeky, tease and make fun of her. The main thing is to keep changing things up.
Keep women guessing and you will NEVER seem boring.