Tattoos on body

I'm creating my girl around a character I created for my manga however the character requires a small tattoo on her chest. I want to do the tattoo but I'm a tad bit afraid because I don't want to mess it up and end up messing up her body. what is the best materials to use?

I would suggest to give it couple of sealant layers before starting. That way if you make a real bad mistake body is protected and you can wipe it and start again.

 

Best thing to use I think would be watercolour pencils to make the sketch. You can adjust this with normal eraser if you make a mistake when you are confident with the design you can use acrylic paint or whatever you wish on top :3

And seal again of course!