My 25 years of palaeoart chronology...
In 2022 I worked with McIlroy et al on a new description of Haootia (Stauroza), from the Late Ediacaran (550 Ma). The Haootia fossils from Newfoundland, Canada, have the oldest known evidence for animal muscle tissue. Also in this picture is a reclining Charnia and Parviscopa.