Summarize:

There are a few different products you can choose from to add a bit of shine and start blending your eyeliner. Note that this isn't the actual gloss, but will add a bit of luster to get you started. For this, you want to use a wax-based product that isn't overly sticky. A wax-based product like MAC's Mixing Medium Shine is ideal. If you don't want to shell out the cash for a designer product, you can use some waxy lip balm to create the same effect. If you're trying this look out for the first time, it might be wise to save the cash and try creating it with cheaper products. If you love the look and want to wear it often, however, it's worth investing in the longer-lasting products that are created specifically for the eyes. Whether you're using the MAC product or a bit of balm, you'll apply it the same way. Get a bit of the product on your fingertip and press it onto your eyelid. Using a light hand, carefully use the product to smudge out the kohl eyeliner you previously applied. Gently pull the eyeliner up the lid to create a softer, smokier effect. If you want your lash line to be darkest, you can certainly add a bit more eyeliner to your lash line after you've smudged it out a bit. Remember, though, that this look really isn't about precision or stark lines. Finally, after you've blended your eyeliner and laid a shiny foundation, it's time to apply your gloss. There are a few different eye glosses on the market, like MAC Eye Gloss, NYX Lid Lacquer, MAKE Face Gloss, and Glossier Balm Dotcom. You can find a variety of glosses online or at your local beauty supply store. Use a flat brush or your finger to apply the gloss over your entire lid. Start in the middle and carefully sweep it outwards. If you're worried about your eyelids feeling sticky, avoid applying any product to the crease. Smooth the product to your lid below the crease and a bit above the crease, but don't put any directly in it! If you don't want to buy a product meant specifically for your eye, you can always use a clear lip gloss or Vaseline-type product instead.
Add some shine. Use the product to soften and blend the eyeliner. Finish with your gloss.