Natural enough that they don't look cheesy but nice enough to fool some into thinking they're semi-professional. I used the same concept and technique for GB's Christmas shoot. He was a little fussy so I only managed a few pictures before I gave up. The only thing that you might not have is an outfit. A Santa hat (even adult sized) would suffice but I just happened to have an elf costume from when I was a baby. Yes, that's a 27 year old costume with only one broken button. I threw up a curtain and plugged in some lights (use the LED ones!) for a few pictures using my iPhone.
If you want to take some decent pictures it's way easier then you think.
- use any sort of curtain or blanket as a backdrop
- A good camera on your phone will work just fine as long as you use the focus and no flash.
- If you've already dug out the Christmas decorations, you have props
- An editing app is your best friend. Crop out the carpet or the cat or add a cute holiday message that looks professional as fuck. I use an app called Aviary.