How much would you tip?

So I got a tattoo a couple weeks ago and I'm way over thinking the tip that I left. I got a simple daffodil with two names written on it. Its between 2 and 3 inches, it took about a half hour to complete. She charged me 80 for it and I gave her 90 all together and now that I'm thinking about it, I feel like maybe it wasnt enough?

I plan on going back in a couple weeks for a much larger tattoo and I dont know if I should feel weird like I under tipped her and she may not be interested in taking me back as a client in the shop? (The shop has like 6 different artists.)

I'm definitely waaay over thinking it but I'm just wondering if you think I under tipped her or if it was an okay amount to leave?