Continuing education recommendations?

First year tattooer here! I’m still working with my mentor, who I am grateful for any and all information, but I want to expand further on some areas I know he doesn’t really have interest in. I’m looking for recommendations for drawing (neotrad & realism preferred) or for tattooing techniques (coil preferred). I’m open to Patreons, online seminars, and in person seminars. Books as well! Thanks in advance! :D