Hindu temple iconography is a difficult subject. It takes a lot of reading and understanding of the philosophies behind the symbolism to get at the basics. Then of course there are the varying interpretations of each symbolism as per the philosophy one tends to believe in. There’s a saying in Bengali : joto mot, toto…
The various Durga-Mahishasuramardini pratimas as seen through the ages – a pictorial depiction
The ugra aspect of the devi is best characterised by her Mahishasuramardini image, which has been depicted in various ways over the centuries. The Vedic text such as Vajasaneyi Samhita, Taittiriya Aryanaka, Kena, Mundaka Upanishads, Sankhayana grihasutras mention Durga in her various forms; the soumaya (quiet/placid) forms among them being that of Gauri, Parvati, etc….