Depending on the image, brushes are great. I have used them many times, however, with some images the eyes just don't lend themselves to brushes. It is sometime better to use the pen tool and paths to create a set of lashes one lash at a time (it really doesn't take long once used to it). You'll need a tablet for the best results.
Create new layer. Start on one eye; top lashes. Use eye dropper tool, select natural color of lash. Select a hard brush - one or two points depending on the image ( practice makes perfect). Make a path ( one at a time for each lash ) that follows the natural line of the lash. Go to the fly out menu on the paths pallet. Stroke the path. Do this for each lash. Vary color of some of the lashes a tad. Look at real lashes and see that they are not perfect, sometimes they overlap each other. Once finished and satisfied with the contour of the top set of lashes for one eye, g blur just enough so the stroke is not hard and looks natural. You can also lower the opacity a bit. Not dark enough? Dup the layer play with opacity of the top layer and merge. Once done with one eye dup layer flip horizontal and rotate and tweak to fit other eye. Now on another layer follow the same steps for the bottom lashes. Much more custom and realistic effect for close up images. Of course takes a bit more time than a brush but worth the effort.
Hope this helps.
~Nancy
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