Ibegan to undress, but in spite of every effort i could not keep myself from stealing a glance every now and then at the picture; and a glance was now sufficient to distress me. even when my back was turned to it, the idea of this strange face behind me, peering over my shoulder, was insufferable. i threw off my clothes and hurried into bed; but still this visage gazed upon me. what effect does the tone of the excerpt have on the reader?

it produces shivers down their spine, or a feeling of unease.  

Explanation:

answer; i believe the correct answer is ( indirect characterization);

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."