When Victor describes the monster in Mary Shelley's novel, Frankenstein, what terrifies him most?

In Mary Shelley's Frankenstein, there
is a great deal of vivid imagery that helps share Victor's sense of horror when looking
at the creature he has brought to life.

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...by the glimmer of the half-extinguished light,
I saw the dull yellow eye of the creature
open...

Victor then describes
how it takes its first breath. In an instant—a moment of epiphany—the pains Victor
Frankenstein had taken to construct a creature of beauty are illuminated before him to
see, instead, the truth of what he has done: he has made a horrifying mistake, a crime
against God and nature—a monstrous looking being.

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I had selected his features as beautiful.
Beautiful!—Great God! His yellow skin scarcely covered the work of muscles and arteries
beneath; his hair was of a lustrous black, and flowing; his teeth of pearly whiteness;
but these luxuriances only formed a more horrid contrast to his watery eyes, that seemed
almost of the same colour as the dun-white sockets in which they were set, his
shrivelled complexion and straight black
lips.

Victor flees from his
workroom and falls asleep only to waken to the creature reaching toward him, grinning.
Once again Victor runs away.

He
writes:

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I had gazed on him while
unfinished; he was ugly then; but when those muscles and joints were rendered capable of
motion, it became a thing such as even href="http://en.wikipedia.org/wiki/Inferno_(Dante)">Dante could not have
conceived.

The potent and
precise imagery Shelley adopts in describing the monster's appearance, along with
Victor's reactions, brings to the reader's mind a sense of horror similar to the
creator's. Victor Frankenstein's responses are all based simply upon appearance, which
will be one of the creature's criticisms not only of Victor, but also of society in
general.

It seems that the creature's looks horrify Victor
the most. I can only surmise, but it is perhaps the eyes that would be the most horrific
of the things that so chill Victor's heart because as people we often look to a person's
eyes to glimpse one's thoughts, intent, emotions, and soul. In this case, it may well
have seemed to Victor that the creature's eyes, so bizarre in their color and
presentation, would have been most haunting and terrifying.