You can add anything you want for a finishing touch, but here are some examples that work well:
Highly-detailed, surrealism, trending on artstation, triadic color scheme, smooth, sharp focus, matte, elegant, illustration, digital paint, dark, gloomy, octane render, 8k, 4k, washed-out colors, sharp, dramatic lighting, beautiful, post-processing, picture of the day, ambient lighting, epic composition
For the example on the left, the prompt was summarised to, “An oil painting of a panda by Leonardo da Vinci and Frederic Edwin Church, highly-detailed, dramatic lighting”