Develop a serene and captivating adult coloring page encapsulating the theme "Farmers at Work". The illustration should feature farmers interacting with livestock, like milking cows or shepherding sheep. Incorporate elements like barns, wooden fences, and farm tools. While detailing is encouraged, the illustration should remain consistent with clean and minimalistic lines, embodying a sense of calm and routine in the farm's activities. Make use of proportional drawing to highlight the interaction between farmers and their animals. --ar 3:4 --v 5.2