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Internet sources of the photos:
Four Deities in one Mandala, accessed February 17, 2020, https://paldenshangpa.org/combined-accomplishment-of-the-four-deities-lha-chi-dril-droup/4-deities-2/.
Green Six-Armed Mahākalā, accessed February 28, 2020, https://www.amazon.co.uk/Tibetan-Buddhist-Six-Armed-Shadbhuja-Mahakala/dp/B00MPGN3JW.
White Six-Armed Mahākalā, accessed February 17, 2020, https://www.shangpafoundation.org/library/artifact-page/white-protector/.