thank you everyone for ... thoughts.
matching two sides in colour version wasn't a problem, infact i matched them in colour 'n then converted to b/w. colour version too looks good but then things like twigs, rocks, plants looks more distinct and distracting, as long as i wanted to portray it with the psyche related theme. moreover, b/w version has much louder impact and is reduced to very essence, i feel.
thanks once again.
-- nevil zaveri