premise: There is a dark-haired woman sitting behind a computer with her hands resting on the keyboard. hypothesis: The woman is pretty.
neutral: Sentence 2 states the generic term woman  which cannot be inferrerd from sentence 1 as sentence 1 is specific that the woman is dark-haired.  In sentence 2 pretty cannot be inferred from sentence 1 as sentence 1 does not refer at all to her looks with regard to beauty, ugliness, or otherwise.  It only refers to her action of sitting, where she is sitting and where her hands are resting.