According to the greek myth, Heracles saves Prometheus that was chained by Zeus after he has stolen the fire and gave it to humans. This diorama reflects the imagination of Mihai Marius Mihu about the story of Heracles confronting some myth creatures who guarded the temple on the foot of the mountain where Prometheus was chained.
Quoting the author:
(I wanted to include the chained Prometheus in the diorama but the lack of pieces forced me to make them separated www.flickr.com/photos/mihaimariusmihu/9515653462/). The emblem on the minotaur shields and the decorative bird statues on the architecture are to relate to the eagle that torments Prometheus.