A couple of things about tattoos:
1. Getting a tattoo is painful and expensive. Getting a tattoo removed is significantly more painful and expensive. How much do you really want this? My suggestion is that, especially if you want to get a big, difficult to cover tattoo, wait for two years and see if you still want it.
2. Russian prison tattoos have a specific cultural meaning. Are you sure that's a meaning you want to espouse, especially since you haven't earned it yourself? (I'm assuming you're not currently planning on being incarcerated in Russia, of course -- if you are, well then, go for it.) Furthermore, are you sure that's a meaning you want other people to think you espouse?
3. Russian criminals don't look kindly on people who get tattoos without earning them. You probably won't run into any trouble, but...
I think prison tattoos are fascinating and beautiful, but I kind of think it's something you shouldn't get unless you're actually part of the criminal culture.