The ornamental design for a curvedcanopybedheadboard, as shown and described.
FIG. 1 is a top perspective view of a curved canopy bed headboard showing my new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a left view thereof;
FIG. 8 is a right view thereof; and,
FIG. 9 is a top perspective view thereof.
The broken lines showing of orifices in FIG. 1 and FIG. 9, the broken lines showing of drawers in FIG. 1-3 and FIG. 5-9, and the broken lines showing of a bed in FIG. 10 are included for the purpose of showing environmental structure and form no part of the claimed design.