Design a panoramic image of a mountainous city during dusk in winter, focusing on a mysterious and moody atmosphere. The scene should depict a bustling street adorned with striking street art, its colors muted by the encroaching night. In the foreground, snow-covered sidewalks reflect the dim light from nearby shops, while the distant mountains create a stunning backdrop. The sky is a gradient of deep blues and purples, hinting at the mysteries that lie within the city. The overall composition should evoke a sense of intrigue and allure, inviting viewers to wander through the streets and discover the hidden gems of this captivating urban environment.