If the number of pimples in her face is on your list, you are probably over-specifying...
More seriously though, it's all up to you. I think your picture should not be overly specific ("she has to have 13 pimples on her right cheek and 17 on her left"), but also not too general ("just as long as she is human"). But, ultimately, you get to decide which qualities are deal breakers or makers.
Looking at myself, there are some qualities / attributes that I find non-negotiable and others that I am very flexible with. Her hair may be red or blond, long or short, curly or straight (although I do have a strong preference for long red hair), but she absolutely has to be a non-smoker.
I've long felt the non-smoking thing was bit silly of me - until I tried to kiss a smoker would-be girlfriend. Yeach! Never again!
Now, many people may consider smoking not to be such a deal breaker for them, which is their good right. Just as it is my prerogative to avoid being intimate with girls who do smoke.
Hope this helps,
Jim.