Create an image of a mythical creature, such as a dragon or phoenix, adorned with vibrant street art graffiti against a backdrop of a swirling galaxy in the night sky.

Create an imaginative illustration of a mythical creature resembling a dragon or phoenix. The creature is covered in colorful street art graffiti, bearing prominent features such as wings, scales or feathers, and a beak or snout, in an amalgamation of fantasy and urban art. It is silhouetted against a backdrop of a galaxy spiraling in the night sky, with multitudes of stars strewn around and twinkling emanation of nebulae. The galaxy is depicted in swirling tones of blues, purples, and blacks, contrasting against the vibrantly painted creature.