Beistle 52027 Ocean & Sky Backdrop, Plastic, Multicolor

The dimensions are stated as 3 by 30. I'm trying to use it as a backdrop for photos. Is this wide enough for four people to stand in front of?

Does this come packaged as a roll or folded up? Is it shiny?

What is it made out of?

Is this okay to use as a decoration on a door putting different stickers on it and taping it if so how many do I need to order