Quote (WarCow @ Oct 20 2010 05:14pm)
The 50mm f/1.8 is a very good lens, especially for the money. You just need to use a bigger aperture to get more in focus. I'd say like f/8 or so.
If you're shooting wide open at f/1.8 - even if you focus on one of the eyes, the eye farther back is going to be out of focus since it'll be out of that very narrow DoF.
Edit : Post the settings you used when you took the pictures.
^This. Since the bg is white, you don't really need to throw it out of focus by selecting a small aperture. Shooting wide open also reduces sharpness of the image and somewhat prone to CA.
Also, do you have a reflector? They're great for portraits and is uber cheap (roughly $10 each when on sale).
Shoot by a north facing window and try to bounce some light with the reflector back onto the subject's face that isn't being window lit. Have the flash shoot from behind preferably diffused for some hair light. Use the white side for soft images and the silver side for punchier images.