Create a subtle animation inspired by the provided image of penguins and cake. Add gentle blinking movements to the eyes of the penguins, along with small head tilts to convey liveliness. Make the penguin holding the cake slightly sway as if presenting the cake happily. Add a soft waving motion to the flags and small, cheerful sparkles around the cake to enhance the festive mood. Keep the movements minimal and smooth to maintain the original charm of the illustration while adding a playful, lively touch."