Thanks for the comments guys
I see what you both mean with the grape shot now I look at it, unfortunately I've cropped the shadow off like that on the photo, not in photoshop. As for the lighting, I just used a 60w desk lamp pointed at the grapes, and a plain piece of white card, and set a manual white balance from the card. It still needed the levels tweaking in PS, so I think I need to learn a bit more about adjusting the wb to get it right without PS.