People are always trying to impress each other, especially since modern society places such an emphasis on the exterior. That's why clothes, cosmetics and coiffure are so lucrative. If you're looking for a soulmate, focusing on the facade could be a fatal flaw.
Look beyond the mask. Go deeper. Does he or she have a good heart? Don't focus on their appearance. Close your eyes and listen; discern whether you hear a tone of compassion and caring or a tone of egotism and blemished character. If you listen carefully, you'll be able to hear it. Don't be fooled.
Before a date, the best thing to do is to pray for Divine guidance, that Hashem should show you if this person is the right one for you. Don't go it alone - Hashem will be happy to help, just ask Him!