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i am a female, how do i say i am a photographer in russian ?

photography = фотография

"I'm a photographer" - "Я фотограф".
"nikola's studio" - I don't understand what you mean. Perhaps "Фотостудия Николы" if "Nikola" is female name.
"nikola's photography" - perhaps "Фотография Николы".

photography - фотография;
nikola's studio - фотостудия Николя;
nikola's photography - фотография Николя.

"Я фотограф" - It's the same for men and women.
Nikola's studio - Фотостудия Николы.

Я фотографиня- it is in ironical tone
Я фотограф. Someone can call фотооператор it is not so rightly, but I meet this calling.
Фотостудия Николя, if you mean female’s name. Else Фото от Николя, but I think a Russian
would prefer to call that studio something like NikolaStudio
Are you really photographer? I myself one.

Я фотограф. Я фотограф профессионал . Я фотограф любитель. У меня есть хороший фотоаппарат.