Hello, I just joined this website. I started tattooing 3 years ago and stopped because of safety reasons also do to moving. Recently I started tattooing again, I have prior knowledge from what I knew but I constantly look at videos, look at this website, ask for advice from tattoo artists as well since there’s always more to know. I can’t seem to get sharp solid lines one time. I’ve been practicing on people who allow me to work on them for free. My tattoos for the most part aren’t bad but I have to go over the lines twice almost and it seems to take up more time and I can’t seem to ever get it right. I use very little Vaseline, I usually run my tattoo pen at 7.5 volts and usually the needles range depending on tattoo but I generally use a 5 or 7rl and I try not to go too deep into skin. I will start a tattoo after prepping it, start the line and when I wipe away some of the line is there and in some cases the line doesn’t even show up. I don’t want to dig into someone’s skin either. I practice on pig skin a lot and my lines come out perfectly but it just is completely different when I do it on regular skin. What am I doing wrong? There are some examples below 

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