OMG I thought he encased real goldfish in resin. He hand paints each fish layer by layer within the resin to get this effect. Riusuke Fukahori Paints Three-Dimensional Goldfish Embedded in Layers of Resin
resin paintings by DeviantARTist Kenglye. He creates the effect by pouring a thin layer of resin, painting that layer, pouring anothe thin layer, painting that one, and repeating (the octopus heads that poke out of the water are pebbles).