i was reading where people where having trouble finding their hairline.this is the easiest way ive found.sounds technical its not. when your hairs on or you like your position take a shoestring, take tip of string and place on your inner eyebrown near your nose now run string up to front peak and mark that point on shoestring with sharpie now you have the exact starting point of your hairline using an unmovable point of refence your eyebrow.there should be minimum 4 fingers apart from brow to hairline,the golden ratio of facial symmetry is hairline to brow matches lenth of eyebrows to tip of nose and tip of nose to chin tip should all be equal to have a perfectly symmetrical face,no one does but closer to that you are better you look.so you can get the hairline right at least.also marking with brow pencil is harder,brow pencils are denser and stronger and drier an easy marker that will wipe away with no trouble is lipliner,it has no staying power.brow pencils are meant to grip.lip pencils have to be emoillent for lips.a brow pencil that touches any glue with grab and youll have a dark glue line.another trick is any hard plastic packaging ,you know the ones that are impossible to remove and you hate opening,take a flat piece from back of package lay your piece on it and trace your hairline onto it,cut out with exacto knife or blade.now you have a hard plastic template.once you have your peak or first dot made with your shoe string,place template agaisnt it and youll have your hairline and can easily mark temple points.sounds like alot but in long run you dont have postion repostion adjust you have exact perameters and its consistent.your hairline is always the same.also bonus tip if ur hairline and skin dont match exactly, in makeup hairlines are always contoured or darkened to make face more attractive,it enhances natural hairline,if you take a fan brush,google it,looks like a fan,picks up a small amount of pigment so you get light application.run brush across an eyebrow powder the color of your brows,yes eyebrow powder(ive used a grey eyebrow powder and a fan brush on photo shoots to make a model with shaved head look like the he had a few days regrowth all over and make a perfect hairline that lasted all day in a swimsuit shoot in a pool,just set with kryolan setting spray and its waterproof)so itll stay,dab dont rub hard,i dab it across hairline the lightly brush back n forth to blend,you dont need but a swipe or two,your just making a slight shadow that hair has to unify forehead and unit so theres no color differention or even use a powder bronzer.itll make the hairline and scalp the same at the joining point and make you look more sculpted.powder wont streak or run itll just wipe away may make your glue darker but in summer months when face is tan and unit might look lighter and make a visible line it conceals that.hope that wasnt super confusing if i didnt explain it well i can try again,i do this everyday of my life so i had to make it a stramline fool proof routine.just wanted to share.hope it helps somebody.