Starting 2024 inktober 52 with something ancient. I have these alien species based on a common ancestor that was not unlike an early sea slug.

The two forms of life were the Fermax (a tall, purple, matriarchal race. Think a giraffe meets purple sea-horse) and the Limoux (smaller, green with branching orange exterior lungs, genderless and more nurturing. Think sea slug meets a rabbit). I suspect that in the primitive forms there would be a version of cave painting. The Fermax who were omnivores would have been actively hunting and may have done the basic drawings of such acts (the bolder parts). Whereas the Limoux ware vegetarians and were more social, so they would have had more abstract art works with more uses of what colours they and available.

I imagine the two races drawing into one another art work as they made cautious introductions to each other in the early days. The Fermax displaying their hunts and the creatures they chased, whereas the Limoux would add pattens and colours and emotions to the scenes.