姿(ようし) Appearance, only used about humans. Unlike 要望、 容姿 tends to emphasize or be used about their clothes.   PPP
(がいけん) The outward appearance of anything; human or object.   $$$
(みため) Same as 外見.
(がいかん) Pretty much the same as 外見、but 外観 tends to emphasize a detail of the appearance, whereas 外見 is only used about the overall or general appearance.
(ようぼう) Similar to 容姿, but 容貌 also includes a judgment of the person’s insides or general vibe, not just their clothes. Like, Einstein had crazy hair and stuck his tongue out at the camera, giving him the general vibe of a homeless guy.