Mary Shelley's Frankenstein

Mary Shelley's Frankenstein, Victor states."Oh! No mortal could support the horror of that countenance. A mummy again endued with animation could not be so hideous as that wretch. I had gaze 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 Dante could not have conceived". How does Victor's disappointment in the creature's exemplify Romanticism?