Appearances are everything (seriously):
Hairstyle: Avoid the latest radical style cut and stick with conservative, professional styles.
Hair color: No unnatural hair color. I.e. Pinks, purples or electric blue.
Hair length: Above shoulder length, or at the collar. Do keep your fringe above your eyebrows.
Jewellry: Minimal and petite. No big dangling necklaces, no trinkets with bells. One ring on each hand.
Wrist watches: Accepted, so long as they’re conservative. Don’t try for the latest pop-princess hyper-white watch with an enormous band.
Makeup: Minimal eyeliner, blushes, other highlighting and natural tones only.
Piercings: Not allowed. Perhaps with the exception of fine studs in the ears.
Tattoos: Always covered by clothing. Neck or face tattoo? Not a chance!