Rain I'll tell you what was set up with us (which has worked and we stick to).
We send photos and a letter twice a year. We receive a letter twice a year.
Personally, we don't feel there is any risk but we may stop the photos in the future.
He was three when he came and has been with us almost 3 years.
There are no siblings.
I think you should agree to whatever you are happy with.
I would not pick a fight or complain about social worker. I think there is little point and they will soon be out of your life.
Anything you can agree to could change. You won't be able to control what the birth family do. Saying no to photos or drawings from them now is fine, just be aware the offer may not be made again.
I think knowing what birth family look like could be very useful.
You do not need to show your child while they are a child.
Personally, I would not want gifts from birth family. Storing age specific gifts could be a pain. These could cost birth family a lot and this also might create an 'artificial' feeling of closeness or obligation if given to child.
Drawings seem fine.
Sending photos is trickier, our child's photos are viewed at social services centre.
Contact letters are to us as adults and from us.
Feel free to ask me anything you like.
Good luck.