Concept 1: Cool looking for a tattoo style. It's too busy and makes me not want to try figuring out what it says.

Concept 2: Plain, simple, smooth, the size and snake design gives it a little "in your face" attitude. I like it. Take the colors of concept 1 and see how it comes out? Just to play with it a little. Might depend on the background you put it on as well. Needs a little "flare" IMO, but I could be wrong on this part. Otherwise, I think you're good here and the more I look at, the more I like it.

Concept 3: I like it, but feels like something is missing. It reminds me of a title of a kids book or branding of a publishing company.