[Quoth]

Well, raven-haired is OK once or twice, but not more often. It's a traditional description for very black hair in British Isles.

It is annoying in a novel if the author keeps repeating the descriptions.

I find "ginger" annoying in a book (and IRL), especially if linked to a fiery temper. It's English bigotry. It's historically red hair (which is various shades none of which are red) and people's temperament is nothing to do with hair colour. Ginger is used as a term of abuse to redheads in England, because usually they are Scottish or Irish. Finns, Jewish people (less common now) and a Eurasian region formerly in the USSR are the other commonly red-haired people. Supposedly King David was a red-head.

While we are at it, black eyes and violet. Some brown eyes (the overwhelming common colour) are very dark and blue eyes may seem slightly violet in some lighting conditions, or on film. In fantasy non-humans can have strange colours, but AFAIK no real animals have a black or violet iris.