Best thing you can do is to actually go to a tattoo parlor just to "shop". They have tons and tons of drawings, sketches, and complete tattoos arranged on the walls and usually also in big binders at every tattoo shop. You can look through them and get a feel for what you like.
Also, when you've found something you like, you can always "edit" it till it's just right. You can have them color something that started out B&W, remove color from something that started out rainbow, splice several tattoos together, take pieces off existing tattoos….pretty much whatever you ask them to do, they can do it.
When I went to go get my tattoo, it took me almost 45 minutes to get it looking just right. They do it on paper first, using scissors (for cutting/editing) and photocopiers (for sizing/adjustments) and then when you give them the OK, they put it on your body.
Source:http://www.mytattoodesignslive.com/rose-tattoo-on-upper-thigh-hip/
