The ornamental design of a transparent protective facemask, as shown and described.
FIG. 1 is an upper right front perspective view of a transparent protective face mask showing our new design. The upper left front perspective view is identical to the upper right front perspective view;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof. The left side elevation view is identical;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top down plan view thereof; and,
FIG. 6 is a bottom up plan view thereof.
The broken lines in FIGS. 1-6 illustrate unclaimed environment, such as straps, and form no part of the claimed design.