Footsteps outside the door without anyone has been there?

Hello guys!

Im developing a scene and i keep getting the “strange” feeling that’s dosen’t seem realistic even with alot of stuf at the scene now. But i just reminded about that im missing some details like that (the title). And the scene would been much more realistic if i had some footsteps front of the door at the winter scene without i had to go there. How can i make some footsteps without have made any movement from before.

Just add some decal mesh with footstep textures on?