combination of properly lit green/white screen and floating masks in post i’d say..kinda tricky
after effects might be a better way.
or you could go the old school route and build a theatre-style ‘flat’ and cut a square into the middle through which the talent is visible, you could put in a picture frame in in post of do it for real by cheating the perspective..
or you could shoot the talent – layer 1
shoot the wall & picture frame, greenscreen the picture surface – layer 2
do a composite of both layers and fiddle about with arms and bowl overlapping the picture frame using chroma or luma keys
hmm interesting..we know of a location where theres a piano and a harp and old fashioned statues and busts etc.