YOU SAID:
I’ve studied all the pictures
INTO JAPANESE
私はすべての写真を勉強しました
BACK INTO ENGLISH
I have studied all the pictures
INTO JAPANESE
私はすべての絵を勉強しました
BACK INTO ENGLISH
I studied all the paintings
INTO JAPANESE
私はすべての絵を勉強しました
BACK INTO ENGLISH
I studied all the paintings
That didn't even make that much sense in English.