If you are starting in the world of tattoo I recommend you before tattoo on human skin practiced in orange peel, cambur or at best synthetic leather or pork skin, do not take it lightly remember that it is something that the customer will take all his life, pending with the lines, must leave clean and continuous. How deep are these nailing the needle and what voltage do you use? remember also the moment of drawing a line that you must be constant in the depth of the dive, control the breathing and take the line calmly. I have several months tattooing and I think I could help you a bit in the process. Sloping also with the sanitary part, is extremely important. Greetings from Venezuela and keep it up, we are reading <3