Conflicting characters

I have just completed a great exercise on my Writing Fiction course, it involved writing a few paragraphs about a character to show conflicting sides to them. This week's study is about how the characters in a story who make the plot and the choices that they make that determine which direction a story will take. 

I chose to write about a stereotypical librarian figure and her not-so-conventional alter ego:

Susan waved her polite goodbyes to her colleagues as she quietly stepped outside after a day at work. Having arrived early at the library that morning, she had made sure that she had time to catalogue the new book arrivals for the day and tidy the shelves. Everyone who worked with Susan would describe her as shy; she was polite and hardworking, never raising her voice or daring to take an extra few minutes on her lunch break. Her hair was styled into a tight bun on top of her head, her skirt was knee-length and was smart brown wool-blend and paired with a beige blouse, nothing about her appearance demanded attention.

She walked around the corner, out of sight from her workplace. Then she pulled her skirt up until it was thigh-length at most, displaying a tattooed garter around her leg, she pulled a packet of cigarettes from her bra, lit one and inhaled deeply before heading down the dimly-lit alleyway behind a backstreet boozer. In a few hours she would be swinging herself around a pole in front of dozens of drooling men. She would need a few shots of tequila first. She unpinned her brown hair and it spilled down her back, exposing the flashes of bright red of the dyed tips.

It certainly makes for an unusual character! A great way to start building all-rounded characters.