How does Ann Ward Radcliffe use imagery in The Italian, or, the Confessional of the Black Penitents?

Imagery:

"Alas! I have no longer a home, a circle to smile welcomes upon me! I have no longer even one friend to support, to rescue me! I — a miserable wanderer on a distant shore! tracked, perhaps, by the footsteps of the assassin, who at this instant eyes his victim with silent watchfulness, and awaits the moment of opportunity to sacrifice her!"