Hi Mark,
Finally getting round to catching up with commenting
Fruit - Good alternative to the theme. Nice colours and dof and no you can't beat edible props
Vehicle - The edit is good, the white spot did draw the eye other than that I like the colours and good black bg
Piece - Lovely blue against the black bg and well done with the reflections but my OCD would like the chain to be more even and I think it might have worked well in portrait too
Contrast - Nice idea, I do think it has legs but its not really contrasty enough but sometimes you just have to let it go and move on, you might come back to it later and it will work. Might have worked on a reflective surface, just a thought
Curve - I like this there's lots to look at. Nice curves on the track and the grass, it is a bit on the tilt but its tricky to straighten or crop without losing the marshals and I like that detail