Curtain tieback clip

FIG. 1 is a front elevation view of a curtain tieback clip showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view, the bottom side being a mirror image of the shown; and,

FIG. 6 is an isometric view thereof.

The broken lines in FIG. 6 of the drawings depict a curtain and a window as environmental subject matter only and form no part of the claimed design.