I'm a tattoo artist who underwent a standard apprenticeship under a certified tattoo artist. I am an artist first, tattooer second, which means I put creativity and art into my tattoos, not just the 'you pick it, we stick it' type of tattooer. Apprenticeships for tattooing vary by state, according to the laws. I'm also a trained body piercer, as well. Any questions about the job or apprenticing, I'd be happy to help!
PLEASE NOTE: I will NOT price tattoos. Seek a shop for that.
                             If you weren't half bad, as you say, you wouldn't have closed a U and made it look like an O.
My advice to you is quit tattooing yourself, go see an actual tattoo artist in a shop to fix it, and if you want to be a tattoo artist, do an apprenticeship like everyone else who becomes a tattoo artist. Then you'll be taught how to not turn a U into an O. 
                          
That's completely up to the person, but I have noticed that spontaneous tattoos are generally regretted later. Either the subject is regretted, or the placement (for example, someone wants to plan out an entire sleeve and we have to work around a little butterfly tattoo they got when they turned 18 or cover it up, which isn't easy). I am covered in random, spontaneous tattoos (we used to get really bored at the tattoo shop in the off season and would practice new techniques on each other) and I regret a lot of them. I hate how splotchy and not-brought-together my body art is. I think if you wait until you have something meaningful to tattoo, there's a lot less chance of regretting it later.
I happen to be one of those artists who has to look at a refernce to draw, as well. I'm great at piecing things together, so if I have a custom piece to draw, I usually either take pictures myself of different components to piece together, or search for actual reference pictures on the internet. One of my favorite pieces was a custom compilation of animals that my client had seen on a nighttime safari trip in Panama. I looked up pictures of each animal and drew them together in the shape of the country of Panama to create the custom piece.
It all depends on the tattoo. Without seeing it, it's hard for me to tell someone if it can be fixed, is better covered up, or should just be removed.
Professor
 Are professors really subject to the "Publish or Perish" policy?
Are professors really subject to the "Publish or Perish" policy? 
                                        
                                        
                                             Court Reporter
 How do you transcribe when people in the courtroom are talking over and interrupting each other?
How do you transcribe when people in the courtroom are talking over and interrupting each other? 
                                        
                                        
                                             Security / Bodyguard
 Have you ever had to disarm an attacker?
Have you ever had to disarm an attacker? 
                                        
                              
                             In all honesty, it happened because blacklight tattoo ink isn't meant to last. It's a fad- not something for long term. It fades very quickly- within 3-6 months max. It's a horrible way for tattoo artists to charge more for a tattoo because the ink costs more, and because it will have to be touched up several times a year (which they will start charging you for, to keep it glowing). I've never done a blacklight tattoo nor will I ever because they don't last, the ink doesn't penetrate the skin the way normal ink does, and it comes out looking spotchy and doesn't heal correctly- much like it peeling out when your tattoo healed. 
And, if any artist tells you the blacklight ink is FDA approved- it's not. It's FDA approved for tagging FISH, NOT for tattooing HUMANS. 
I don't recommend anyone getting a blacklight tattoo. 
                          
I haven't had a problem with that, personally. I've had underagers try and tell me they left their ID at home, which is when we rip up the paperwork we started and tell them to go home and get it. They never show back up. All tattoo shops photo copy the ID with paperwork, but if it's a fake one, I'm honestly not sure what would happen.
Lucky Diamond Rich is pretty much one big black-tattoo-ink blob. I barely see any color on his body. If the tattoo is solid black, then no, it's very difficult to put color over black and have it show up. If the tattoo is a black-and-grey tattoo, then yes, usually color can be put over top or used to accent.
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