Looking great!
Best tips I can offer-
1. Turn off the flash - use slower shutter speeds combined with a tripod
2. To get the best DOF (depth of field) close down your aperture as far as you can (Increase your F number)
3. Like Dan mentioned - play around with your white balance.
4. Set up the camera directly across (so you are shooting straight on) from the subject. If you are at an angle at all, the glass will make it difficult to get a clear, focused shot
5. Take LOTS of pictures 
You are on the right track - keep playing with it.