Create a realistic image of Squirtle as if it existed in the real world. Imagine Squirtle with a reptilian texture, similar to that of a small turtle, with smooth, slightly glossy blue skin covering its body. The shell on its back should have a hard, detailed texture, appearing sturdy and well-worn, as if it could genuinely protect Squirtle. Its large, expressive eyes should have a lifelike shine, reflecting a sense of curiosity and determination. The limbs should be strong and agile, with claws that look capable of gripping and maneuvering through water. The background should resemble a serene, aquatic environment, such as a sunlit beach or a rocky shoreline, with realistic lighting that enhances the cool, refreshing nature of Squirtle's watery essence, making it appear as a small, yet resilient, creature truly part of the world.