$f(x) = y^2 - x^2 y -2x^4 + \epsilon x$ , where $\epsilon>0$ and $\epsilon$ is small.

Draw a contour plot in $\mathbb{R^2}$of f(x).

How do I do this? I have no idea, it is not a simple circle.. Please, help

Edit: I forgot to tell, we CANNOT use computer programs. That is why I dont know how to start, I don't know methods for such task.