Upon working with a model this weekend, I perfected an eyelining technique. The thing is that I love liquid eyeliner because it is much sharper than an eyelining pencil and really stands out above carefully-curled lashes. But sometimes, it may not look completely uniform - especially on someone who likes to squeeze their eyes together in fear of foreign objects being placed quite close to their eye by a stranger. This is completely understandable; hence I decided to use both the eyelining pencil and the liquid eyeliner.
Use an eyelining pencil with good pigmentation. I love Prescriptives' Softlining Pencil in Jet. As you close one eye and pull out your lid so that it's pretty smooth, run the pencil from the inner corner to the outer corner of your eye in short, little movements. Once you have your straight line, use the liquid eyeliner (I enjoy Maybelline's Lineworks Waterproof Liquid Eyeliner) to give the line a little more definition. For the liquid liner, I usually start in the middle of the lid so as not to have an excess of product on either end. Be sure to smooth out the line from end to end. And there you have a sharper, more cohesively-lined lid!