We claim the ornamental design for an upholstered headboard, as shown and described.
FIG. 1 is a left front side perspective view of the upholstered headboard;
FIG. 2 is a front view of the design embodiment shown in FIG. 1;
FIG. 3 is a back view of the design embodiment shown in FIG. 1;
FIG. 4 is a right side view of the design embodiment shown in FIG. 1;
FIG. 5 is a left side view of the design embodiment shown in FIG. 1;
FIG. 6 is a top view of the design embodiment shown in FIG. 1;
FIG. 7 is a bottom view of the design embodiment shown in FIG. 1; and,
FIG. 8 is a left front side perspective view of the design embodiment shown in FIG. 1 in the open position.
The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention.