This site looks at some of the Vampire's from Buffy and Angel.

Most vampires look just like normal people most of the time, but they can go into 'vamp-face' at any time, which looks much more scary they usually do this when they are about to kill someone. However, the appearance of some ancient vampires changes to match their demonic nature they usually do this when they are about to kill someone. However, the appearance of some ancient vampires changes to match their demonic nature.
Definitions Of a Vampire
Vampire in fiction: A reanimated dead person characterized by unnatural pale skin and long incisors that are used to suck blood from people during the night. Vampire in Eastern European folklore: A vampire is a dead person who is brought back to life usually by a restless undeparted human spirit. Occasionally during the hours of darkness, it rises from the grave to feed upon or raise havoc with living humans who are usually former family members or villagers. The word Vampire was first used in English around 1790 and was derived from the Hungarian word vampir which is further derived from a Slavic mythical creature called a Upir which lived by eating the living. History
"To make you a Vampire they have to suck your Blood. And then you have to suck their Blood. It's like a whole big sucking thing." - BuffySummers, WelcomeToTheHellmouth

VAMPIRE FACTS
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Vampire hearts do not beat and essentially neither do many of their internal organs function. From pure speculation (nothing substantial has been revealed on either of the series), it is assumed they have a working digestive system. It is also known that Vampires bleed, but how they accomplish this without a heartbeat is befuddling.
Vampires can actually live off the blood of animals as well. Angel, Spike and Harmony are examples of this, as they drink Pig's and Otter's Blood.
Vampires can also eat normal food (whether they enjoy it or not is another question), and are affected by alcohol, caffiene and other stimulants.
Vampires can be infected by a certain poison known as KillerOfTheDead, as seen when Angel was poisoned by Faith in BtvsSeasonThree (3.21 "GraduationDayPartOne?"). It's not certain whether normal poisons that affect Humans affect Vampires as well.
Vampires do not need to breathe, however as an intstinctual reflex from their Human lives, they can and often do.
Vampires must be invited into the home of the living, otherwise they physically cannot enter.
Vampires should not be able to get, or cause, pregnancy. There is one phenomenal occasion when two Vampires have created a child. Darla and Angel (both Vampires) are the parents of the only recorded Vampire offspring, Connor.
Vampires do not have a reflection. This oddly enough includes the clothes they are wearing. To justify this, JossWhedon once said in an inteview that it's got to do with an Aura, also explaining why Vampires clothes turn to dust with them when they are killed.
Disclaimer
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