I’m kinda confused on this. Which one is correct, I have a sentence does it say:
I need someone who takes my picture
or is it:
I need someone who take my picture
"someone who takes my picture" would mean a person who takes your picture regularly. Unless you are a celebrity, you don't have people (who are not known to you) who take your picture.
You almost certainly mean "I need someone to take my picture." The infinitive gives the purpose of you. The infinitive form is always "take".