6. Stretched Eyelids.
DO NO EXTEND YOUR EYELIDS WHILE APPLYING EYELINER! This is the key and the most initial rule of eyeliners. It always gives you an uneven liner.
7. Intensely Blended Eyeliner
Blending eyeliner the right way is probably the most difficult part of the whole thing. Make sure you do it correctly or the results can be awful!