A mesmerizing illustration of a mythical octopus-cat creature. Holding a sign 'Happy Birthday' The creature has the upper body of a cat, with a sleek and shiny black fur. Its lower half is replaced by an octopus body with eight tentacles, each adorned with colorful patterns and bright suckers. The octopus-cat has a mischievous yet fierce expression, with piercing yellow eyes. It stands on a rocky shore, surrounded by seaweed and waves, ready to dive back into the ocean at any moment.