Great thread! I didn't get through all the responses so maybe it was mentioned already, but putting them up high on a chair or desk or other place that they won't or cant jump down

is a good way to get a nice pic. Also it helps to be at their level and make a lot of noises that they don't normally hear you use
...In other words, make crazy lady sounds, jump up and down, wack your hand on your head, etc. //.///// anything out of the "ordinary"