Is it obligatory to comb the eyebrows during ablution, to wipe again from the back of the head to the forehead after wiping from the forehead to the back of the head, and to wipe the cartilaginous folds of the ears in addition to the ear canal and the back of the ear?

The visible and inner parts of the eyebrows and the thin beard, through which the skin is visible, must be washed. For a thick beard, washing its visible part suffices. As for wiping the head, the first wipe is obligatory. The Sunnah (definition) is to start from the front to the back and then return from the nape to the front, but however one wipes, it is sufficient. As for wiping the ears, it is Sunnah and not obligatory. It is recommended to insert one's index fingers into the ear canals and wipe their outer parts with the thumbs, without tracing their folds.