"The median salary for a medical illustrator / animator in the U.S. is $70,650 and can range up to $173,000. Those with interdisciplinary skills in UX design who create apps and AR / VR experiences are in demand and earn $74,880 - $98,000. Adept professionals who advance their role to art director or creative director earn between $89,000 - $122,000 and up to $250,000 (2018 AMI survey data). About 48% of salaried illustrators supplement their income with freelance work."
-- Association of Medical Illustrators
I am a sleep deprived artist trying to make ends meet. :)