Create a respectful and devotional artwork related to Christianity, specifically capturing the essence of Mark 4:32. Portray the singular journey of a small seed as it transforms into a vibrant, towering herb, larger than any other plant around it. In its impressive reach, show it sprouting sizable branches, providing a nurturing haven for the birds of the sky to find solace. Use the artistic style reminiscent of watercolor paintings from the 18th century, employing soft edges, varied tones, and fluidity. Please remember not to include any text or words in the image.