I went in as a walk-in with a handful of pictures of what I wanted to do (watercolor flowers and leaves). All I had to do was add my name to a sign-in sheet and hang out next door at PublicUs for an hour until they called me back in. Britney was great about the fact that I had a few pictures and wanted to incorporate things from each (the overall shape from one picture, color from a couple different pictures, leaf shape from another picture) and had a transfer sheet made up in a few minutes. She showed me my ink options to make sure I ended up with exactly what I wanted before we got started, and she removed one flower from my design because I overestimated how large my body is compared to the tattoo (I would have died on the table if she did 3 full color flowers the size I originally wanted in one day, I think.)
I am so impressed with this shop and their ability to take a walk-in for a 3-hour job on a Sunday. I think most other customers in there were walk-ins as well, and I saw most of them get in and out within an hour total. Pricing was really reasonable. I know I would have paid way more for the same thing on the strip, or even at a lot of local shops that don't take walk-ins.
With watercolor tattoos - they'll do it, but strongly suggest an outline so you can actually keep your tattoo and it doesn't look horrible with time. I opted for the outline and I'm glad I did! It didn't take away from the design and Britney used a purple instead of black for the outline so there's a more natural/gradient look to it. She did a black/grey shading on the leaves in a way that there isn't even a visible outline. It looks amazing.
The only reason I wouldn't recommend going to this shop is if you're shy and getting a tattoo that requires your shirt or pants to come off. From what I could tell, all the tattooing is done in one big, central open space so you'd be visible to most of the tattooers. Customers wait in a separated area behind saloon style swinging doors, so it wouldn't just be random strangers off the street staring at your body if that helps.
Still, I give this place 5 stars! The tattooers do great, clean work and are all super friendly and easy to work with from what I observed in a few hours. I'll definitely be back to get more work done by Britney.