Create a watercolor artwork depicting a beautiful 15-year-old Mexican girl with dark skin and short, straight blonde hair. The focus should be a close-up of her face from a frontal view. Use the softness and transparency of watercolor to capture the delicacy of her features, contrasting the depth of her dark skin with the brightness of her blonde hair. The piece should convey a sense of lightness and freshness, with gentle brushstrokes that highlight her natural beauty and the harmony between her skin tone and hair color.