Self timer & AF
canon sells a very simple wireless remote for $25... check b&h for one, thats were I got mine. It was about 20 ft range I believe which is good enough
basically pose or stand how you like, set the camera to a 2 second timer, auto focus with the wireless remote and quickly hide the remote in a pocket or whatever. it's not a perfect solution but it can work.
of course if you are shooting shallow dof it's not accurate and you will be guessing where it will focus on your eyes, etc..
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