The ornamental design for a handrestcushion, as shown and described.
FIG. 1 is a perspective view of the hand rest cushion of the present invention.
FIG. 2 is an elevation view of the hand rest cushion of the present invention.
FIG. 3 is an opposite elevation view of the hand rest cushion of the present invention.
FIG. 4 is a top view of the hand rest cushion of the present invention.
FIG. 5 is a bottom view of the hand rest cushion of the present invention.
FIG. 6 is an end view of the hand rest cushion of the present invention.
FIG. 7 is an opposite end view of the hand rest cushion of the present invention; and,
FIG. 8 is a perspective view of the hand rest cushion of the present invention in use condition.
The dashed lines within the boundaries of the claimed invention are stitching and form no part of the claimed design. The remaining broken lines show environmental subject matter and form no part of the claimed design.