The high contrast of this dress with the accessories is fabulous. The girliness of the Valentino dress looks really cool paired with black, streamlined accessories (including amazing black diamond and onyx earrings.)
The reason this look works is because everything is pretty simple. All aspects of the outfit stick to the same theme of clean lines. The berry lips and nails add the perfect pop of color, and matching lips and nails is so hot right now. I love this look!