In my experience, a few things are key:
Turn off the flash on the camera.
Tripod.
Check to see if your camera has a macro mode, read it's details, use it.
Turn off lights in room, close curtains if light outside [prevents glare from glass]
IMO, generally `straight on' shots, esp if close-ups, have less problems than shooting at an angle through glass.
Read about white balance in your camera's specs.
Zoom out a little, then crop for the image size you want [IMO many camera don't focus great all the way zoomed in, plus the posted pic size is small enough that you'll want to crop or shrink either way].
Do check the Photography forum for a ton more ideas, suggestions ... and check their stickies.