Bali is famous for underwater diversity and for macrophotography by far the best dive sites are in Padang Bai and Tulamben, each with its own highlights.
Porcelain Crabs, Pigmy Seahorses and diverse nudibranches in Padang Bai or Butterfly Nudibranch, Sean the Sheep and Pikachu Nudibrances and this is just a short list of what we can find for macrophotography in Bali.