The ornamental design for a styluspen, as shown and described.
FIG. 1 is a front perspective view of a stylus pen showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is another perspective view of the stylus pen, in which an electronic device in broken line is provided to illustrate an example environment;
FIG. 9 is another top view of the stylus pen, shown in a position of use positioned within an electronic device. The electronic device is unclaimed and is shown in broken lines; and,
FIG. 10 is an exploded view of FIG. 9.
The broken lines are for environmental purposes only and form no part of the claimed design.