Gravitation and E-field

The shape of the curves are basically right.

For the earht-moon curves, the point where the gravitational forces from the earth and moon cancel each other should be closer to the moon.

For the two-charge curves, I suppose the two charges are not equal in magnitudes, as the field intensity near the +ve charge is shown to be weaker than that near the -ve charge. Hence, the point of zero potential should be closer to the +ve charge.