I am madly crushing on the classic look with a nod to retro style for makeup these days. And no one does classic like Laura Mercier. One of my old favorites is the Laura Mercier Tightline Cake Eye Liner in Black Ebony. I spray some Shu Uemura Depsea Water Facial Mist in Bergamot on the Laura Mercier Flat Eyeliner Brush. Some recommend working the liner into a paste, but I prefer swiping the brush in the cake to get more of a gel. Instead of drawing the liner across the lash base, tuck the brush into the lash roots. I usually start on the top side of lashes, but you can also line the underneath of the root. Move the brush along the lash line, tucking at each stop. The final product is subtle, but defining. For a little more drama, reapply. This also makes the line a little more solid.
If you use Laura Mercier Eye Colour, you can pop out the liner and keep everything together in a three or six-well custom compact for a customized color palette.