Thats funny because I feel almost no approach anxiety when I go direct, being because it's honest straight forward stuff your throwing out there for her to catch onto and start up a conversation. It's super easy, no routines, no stupid tricks. Though, stay away from comments like "your hot" Instead say "I like your style" or "you are cute as hell, whats your name?" this is much more likely to get her to stop and think about having a conversation with you. Though when going direct it's almost more important to focus your energy on your body language, tone of speech, etc to make sure you come across as appealing. Always have something to follow up your statement, introducing yourself is the easiest and probably best route to go. No one likes talking to a stranger. Give it a shot. Cheers!