I have only seen one of your selections that I could maybe, kinda, duplicate..
It was Adam and Eve and they looked small and distant..
I could get my stick figures to sort of look like them.
But the artist did have some amazing looking swirls of color that I could not recreate..Unless a paint by number template could be created..
If you don't have ten grand lying around to pay a professional artist, go to an art class at your local high school or college and start someone's career.