Taking photographs is a permissible profession. You can also take photographs in mixed gathering such as weddings where women are not observing Hijab, but it is prohibited to look at non-Mahram women with lust. Having said that, women must wear the Hijab in the presence of non-Mahram men even in wedding ceremonies. Observing Hijab is obligatory on the woman in any place in the presence of non-Mahram men, even at her own house. It is better to hire a woman to do the photography in such cases.
If the time of dower payment is due then it must be paid in full when the wife asks for it. The husband does not have to pay it on time if the wife agrees to delay the payment. Also if the husband is unable to pay it, then it is permissible for him to postpone the payment or part of it.