All of the artists manage their own bookings. You should book directly with the artist you would like to work with.
Links to booking forms are below:
Rizza Boo
https://www.getink.app/artists/rizza_boo/
Ryan
If the artist doesnt use a booking form you can send an email or DM via instagram to book
Chris
https://www.instagram.com/osichristattoos/
James
https://www.instagram.com/jimic.tattoo/
Varg
https://www.instagram.com/varg.blacktatts/
Natalia
https://www.instagram.com/nataliarainy/