The motion radical 辶 is written last in stroke order, sweeping under the left and bottom. It supplies the idea of distance covered on foot, giving 邈 its 'far away' sense, like 远 and 途.
貌 (appearance) sits inside the walk-radical as the sound element; the reading shifted from mào to miǎo. It contributes no 'appearance' meaning — the distance idea comes entirely from the 辶 radical.
