I think the banana looks great, as do the grapes, but the grapes and cherries could use some SSS. IMO specular is wrong for the apple, it looks as though someone has just polished it before eating and not as it would in a bowl. Muted blurry reflections would possibly be more realistic, though this will increase render times. Don't overdo the samples too much though as the grainy look will simulate the slight bumpiness of apple skin.
For the orange I think that using the bump map to tone the spec/reflections in the pits/troughs, maybe even the colour as well, would be the right way to go.
Fantastic work, can't wait to see it finished
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