|>>|| No. 5569
As far as I can tell, the first one at least was produced for Fratelli Bonella which is a publisher of religious art based in Milan. They could also just be one of the thousands of people selling shitty prints.
I had quite a thorough look for it and all I've learned is that Catholics do not give a fuck about crediting their artists. Maybe it's idolatry.
In your shoes I'd just look for the highest resolution images I can on google (or take some better photos of the ones you have), blow them up in photoshop, apply some filters to make them look roughly like they were painted at that resolution then get them printed somewhere decent.