Even though you don't give the photo to them, they will picture your bb when you are not at home.
My yan yan pictures my son when we are not at home. We found our son's photos at her drawer. At first, I am very angry and afraid that she will do bad things to my son. But as other bk moms say, they can do bad things to your son and your family at any time, e.g. add things into your meal and use your hairs to do bad things lar.
So I don't let her know that we found my son's photo at her drawer. We both pretend nothing happen lor.
I printed many photos to my maid. She sent a lot home. She asked for the picture means she cares about your bb and respect you. It won't cost a lot of money. Besides, she can do whatever she'd like while you're not at home.
So, to build good relationship, take some more for your maid together with the bb. Show that you care about her too.