It seems like your on the right track with these. My 2 cents is the composition in the first pic would be better if say there was a basket or something off to the left or something you were leaving room for but since its just chairs (so it looks) back there I'd say think about putting something else related in that area or maybe rethink the fruit positioning.

Also with the last pic of the wine I like the idea behind it but the shadow takes away from the image and the tablecloth seems a bit blown out too, but with better lighting i think you could get the shot you were going for. You may also want to clean up the glass a bit it seems a bit smudgy. Keep an eye out for whats in the background of your photos as well, you don't want anything too distracting or "busy" even if it is out of your depth of field.

The only other thing i noticed was the fruits seem too wet. I know what you were going for since in many ads you see slightly wet fruits and veggies but i think you went a bit too moist such as in pic 1 the table looks soaked and in 4 the glass is very fogged and moist as well. You want to draw focus to the foods with the slight wetness so when its on other things it pulls away. Maybe more of a slight mist perhaps from a mist bottle onto the fruits then place them where you want them would work.

This is all strictly my opinion and the things i see others may disagree but i figured i would mention it since you were looking for critique. It's good for your first time shooting food, it can be quite difficult at times. Keep an eye on your focus and make sure its focused properly. Look around on deviant art and just online in general for similar pics to maybe notice techniques or get ideas for your own photos. Be sure to post the final pics that your submitting to your manager, I'm eager to see them. Good luck to you!