I was taking a few pictures of a friend yesterday and she wanted full body pictures. I would use the top left focus point, but it would cut off her feet. How would I be able to use a focus point to include the whole body? I know I could use the top focus point and everything would be included, but I'm trying to use the rule of thirds a little bit more. I'm horrible at manual focusing so that's a no for now. 
Example in paint:
I would like for the shot to be composed as in Fig. 2, but obviously there isn't a focus point there.
I read about focusing and the recomposing, but wouldn't that throw the focus off when using a low apeture? I like my pictures to be SHARP.
Any tips, comments, suggestions?

Thanks!



