Hey Folks,

I want to swap techniques to cutout peoples, objects and paste into another photo. but thats not the problem. i want to know how you adjust the picture to the environment at the photo.
i want seemless edges, matching color and so one.

example...

original:http://www.deviantart.com/deviation/41541428/

my try in attachments

i only added shadows. but actually i want to add a brushed floor. but its really hard to get perspective in it.
please tell me your tips