For example, it's not necessary to write, "I have a good sense of humor", it's better to show it with the help of the words and phrases you use in your personal ad. Show that you are an educated and intelligent person through interesting word choice, clear ad structure, and colorful and creative descriptions. And if your personal ad include a poem or something like this, it will be perfect.
It's better do describe yourself first and add some characteristics you seek in a woman, but be careful, try to avoid creating an ad that is simply a mile-long list of characteristics you want to see in another. Get some interesting information about yourself and let the person reading the ad decide if you might be a match.
And there is one more thing you should remember while writing your personal ad: don't forget the details. It's not interesting to read that you love music and theatre, enjoy traveling and adventures. Add some details: what kind of music do you prefer and who is your best singer. Name a recent movie that you enjoyed and a restaurant you visited last weekend. Ironically, it is the very details that are often overlooked as being insignificant or boring, which in fact add the color and depth necessary for a personal ad to be truly effective.