\documentclass[pstricks]{standalone}
\usepackage{pst-func}
\begin{document}
\begin{pspicture}(-2,-2)(2,2)
\psaxes[labelFontSize=\scriptscriptstyle,ticksize=2pt -2pt]{->}(0,0)(-1.5,-1.5)(1.5,1.5)[$x$,0][$y$,90]
\psplotImp[linecolor=red,stepFactor=0.1,algebraic](-1.5,-1.5)(1.5,1.5){(x^2+y^2)^3-4*x^2*y^2}
\end{pspicture}
\end{document}