I don't know if, in italian, they go for dear sir/madam, but that's what i would do if i were writing, formally, to a person whose sex is unknown. Italian or english words, phrases, expressions. Parole, frasi, espressioni in italiano e inglese.
Parole, frasi, espressioni in italiano e inglese. Castani can be used for both eyes and hair (same way you use brown). Paul, what's the norm in italian?
Come abbreviereste la parola numero quando seguita da un numero (p. English and italian language allowed. In case of hair, in italian we use castani (from chestnuts) instead of brown. English and italian language allowed.