This princess looks gorgeous, with her long, dark hair, pink dress, necklaces and earrings, and delicate pink tiara. I would color her dress and tiara in a pale pink shade, her hair in a deep brown, and her accessories with a soft, shimmering white. For an added girly look, I would use a pastel pink color for her skin, and draw a rosy blush on her cheeks. For her hair, I would shade it in a few dark browns to give it an extra bit of dimension. Lastly, I would add small details such as stars, hearts, or flowers to her dress and tiara. This will give the picture an added touch of whimsy and femininity.