Designing tattoos- how best to create detailed flash to help the tattoo artist apply the design?

I have been commissioned to design a series of tattoos. In the past I was asked for permission to use images of my existing art. (oil on linen)

This is the first time I am creating for the sole purpose of the tattoo.

What should I consider that would best help the tattoo artist recreate my work? What is the best medium, etc?

Any information welcome on the topic.