Thanks all for the advices. Actually this murder scene concept was not in the plan at all, the original plan was kinda fashion shoot. But the sparks of inspiration came out suddenly, then we said " hey, y not try something different and crazy!" But unfortunately we can't find the perfect props. What's ideal for me are a real dagger and some fake liquid blood (at least chilli saurce), and a ovbious scar on one of the model's arm (I've seen tutorials teaches how to do that). But all these are not in the plan,:cry: hope can try next time thru a well organized planning.