To me this is the most fun part of the process:
It sounds like your artist knows what they're doing and has skills.
You sound like you've got some ideas on what direction to take things, but nothing super specific yet.
What I do (the fun part) is come up with a list of wants: "It needs to have a woman, and I want it to be a portrait or full body or whatever", "I want her to be sitting/standing/holding something".
And then things I don't want: "I don't want her to appear angry/happy/smiling", "I don't want her to be in a forest"
Usually you can draw a lot of inspiration by looking up other tattoos, and including the things you like/dislike about them into your own ideas. Trim the lists down to something reasonable for your artist, and then let them implement it in a way they think is best.
It's usually a total surprise until you get to the studio, but if you did a good job defining what you want, the artist should encompass a good portion of it in their own style in a way that they know will work. Showing up day of and seeing what they've come up with is the best part.