The ornamental design for an applicator for cosmetics, as shown and described.
FIG. 1 is a top perspective view of an applicator for cosmetics showing my new design;
FIG. 2 is a front view thereof; and,
FIG. 3 is an enlarged top view thereof.
The uneven-length broken lines represent unclaimed boundaries of the claimed design. The even-length broken lines showing the remainder of the applicator for cosmetics are for environmental purposes only and form no part of the claimed design.