C&C per req:
1. Two words: Polarizing filter! Get one - the glare here is killing an image which otherwise has some real potential. Electronics with digital displays are tough to shoot. I prefer to do them in two shots. One exposure for the bulk of the image, and one for the display only. Combine with a layer mask.
2. The lighting is fine, 'though I'm not sure I would choose white for a tomatoe's background (Think colour wheel here). Your DoF is too shallow here; you've got one small area in sharp focus, but the rest is soft As well, don't forget to arrange the leafy, green bits so they look nice.
3. Cute; a little more DoF and a slightly lower shooting position I think.
4. Very nice! Well lit ('though some might say it's a little flat), and properly exposed. The only addition I can think of might be a hairlight to give some separation between head and background.
Just my $00.02 worth - your mileage may vary.
~John