For this coloring page, I would suggest using blues, purples, and greens to capture the serene feel of the countryside. For the woman, a warm blush of pink across the cheekbones and warm yellow tones on the gown of green and gold will bring out her beauty. For the brothers, I'd use shades of grey to give them a strong, solid presence and touch of brown to bring out their rustic charm. The trees and hills could be filled in with shades of green, and the whole picture should be framed in a bright, golden sun, creating a warm, inviting atmosphere.