All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad, sallallaahu 'alayhi wa sallam, is His slave and Messenger.
The ruling about hanging and exposing photograph is already discussed in Fatwa 82040.
The exposing of photographs and pictures does not prevent the acceptance of supplications (Du’a) or other acts of worship as there is no evidence proving that.
Allah knows best.