Orientation of image distortion by the ellipsoidal NFW lens, presented in color maps with contours. The parameter combinations are indicated above the panels: the first panel shows the circularly symmetric case with convergence parameter κ_s = 0.25; the three right panels show the e = 0.9 elliptical case and a sub-umbilic, umbilic, and super-umbilic value of κ_s. The respective tangential (green) and radial (purple) critical curves are plotted in each panel. The color bar at the right side indicates the orientation angles, the contour values spaced by π/8, plus corresponding tilted-ellipse icons for visual guidance.