documentclass[12pt]{article}
usepackage{tikz}
usetikzlibrary{calc}
begin{document}
begin{tikzpicture}
coordinate  (O) at (0,0);
draw [thick]  plot[smooth, tension=.7] coordinates {(-4,2.5) (-3,3) (-2,2.8) (-0.8,2.5) (-0.5,1.5) (0.5,0) (0,-2)(-1.5,-2.5) (-4,-2) (-3.5,-0.5) (-5,1) (-4,2.5)};
draw (-1,0)[thick,scale=0.8]  plot[smooth, tension=.7] coordinates {(-4,2.5) (-3,3) (-2,2.8) (-0.8,2.5) (-0.5,1.5) (0.5,0) (0,-2)(-1.5,-2.5) (-4,-2) (-3.5,-0.5) (-5,1) (-4,2.5)};
end{tikzpicture}
end{document}