Cosmetic Pen

FIG. 1 is a perspective view of a cosmetic pen showing my new design; FIG. 2 is a front view thereof, a rear view being a mirror image of the front view; FIG. 3 is a left side view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a top view thereof; and, FIG. 6 is a bottom view thereof. The broken lines depict portions of the cosmetic pen that form no part of the claimed design.