Use a random number picker like this:
http://www.random.org/integers/
and replace the ''p='' number in the address field with that number, from p=8 to p=38.
Pick as many poses as you like, but you must do all you pick!
You can use down to 5 seconds for each task and add them to a minute.
And pick a similar environment as in the pics, also perform the flash in daylight!
Good luck! I hope you don't mind we follow you around, we will not distract you, maybe take some pics!