What are the differences between Guo Moruo’s early and later works?

Xinyi Collection of Sunset "Shelley's Poems" Dreams and Reality Parasitic Trees and Grasses at the Cross Again Roses on the Roadside Sunset Ink Painting Camellia Tomb White-haired Banana Blossom Iron Helmet Selling Books Shang Ru Village Chicken Returns Before leaving Shanghai, the first sight of Dongping in Kuimen