Before my fifth tattoo, I felt like I had to really want the image for at least a year and that the tattoo had to have significant meaning to me. That worked for the first ten years after my 18th birthday tattoo. Oh, how that has changed ...
My first real spontaneous tattoo was when I took advantage of a cancellation one of my artists had while I was driving home from work. I came home that night with a gorgeous Rose of No Mans Land and she's one of my most favorite tattoos.
Now I like booking in with an artist and coming up with the imagery with them once I arrive. I'll be doing that tomorrow.
Granted what I'm going for is mostly traditional tattoos and I want to make have a lot of those iconic images in my collection.