If you're trying to get a close-up picture of your face, or a particular part of your face and you find it's coming out blurry, you'll want to use the macro mode on your digital camera (the button with the little flower on it). I worked at Best Buy selling cameras a couple of years ago, and found that the cheaper (not "cheap" ones, per se, but the ones that don't cost an arm and a leg) cameras are just really picky about focusing on things when you're trying to take a picture close up, but the macro mode is really the best way to deal with it. If that doesn't work, I agree with groupie...take a picture of the whole face on the highest resolution and resize.
Also, on a more personal preference in photography note, nothing will wash out colors in a picture more than trying to take a picture of a backlit subject, i.e. one with a strong light source visible behind it, particularly when using a flash. Basically, if someone is taking a picture of you outside, or in a room with a lamp or something, you want the light or the sun behind the person taking the picture, not behind what the picture is being taken of. I hope that makes sense, and helps.