The first step is to work in 2D, then select the plane you will work on in the 3D environment.

The first step is to draw a center line so we can mirror the design using the Line → Center Line tool.

The Batman head is drawn using the Line tool.

The third step is to draw the rest of the body using the appropriate tool fit point spline. 

We use the Mirror tool to duplicate the shape on the other side, using the center line as the axis of symmetry.

After that, we give the drawing a height of 3 mm using the Extrude tool.

Change the line color to black using the color palette.