A pity really Natasha
What lens were you using? Also what settings are you using on the focus points? It might be worth just using the centre spot if you are not already, and concentrate focusing on the eye. One thing I have found is that unless you are using a lens with IS then digital is not so forgiving as film. Try and use a tripod or position yourself where by you have a sturdy resting place, up against a post or solid object is ideal, or a bean bag.Even two small ones for the elbows will help. Sorry if you already know this stuff, but if you dont then it will help you in the long run
Look forward to seeing some more from you