Instead of sharpies I bet you would like Magic Ink Glass Body Markers, they are chisel tipped and vary in many colors, they are also quite cheap at $4 a marker
@Sk1Lt1 If you go to school, never do it there.If u record it, pay attention to any reflections of your face and pay attention to anything that gives your identity. Check if anybody is coming before and after you do a tag and always look for cameras.