Exercise; Composition of natural objects

I need to go shopping, the only interesting fruit and veg that I have is onions and garlic.

I tried to shake things up with dip pen but I only liked the simple version in red at the bottom. That layout was my best but I didn't manage to properly represent the papery bit that is left where the garlic has been used in any of the sketches. Funnily they all look better on screen than they did in my sketchbook.
I went shopping today and bought some tomatos on the vine which I thought could make an intereesting composition

Is it cheating to use red and green coloured pencils? Then I tried biro which wasn't very exciting so I added some red pencil. I also did some experiments with red ink which I'm not so keen on. I think the first drawing was the best and gives the most feeling of depth and structure.

• Do you think it is easier to suggest three dimensions on natural or man made objects? Definitely man made because the angles are so much more definite and positive. It was harder with the natural objects especially because the onion was a bit dull.

• How did you create a sense of solidity in your composition? Hatching at oblique angles to lead the eye, and shadow.

• Do you think the arrangement of your composition makes a different to your approach  and the way you create a sense of form? Some compositions leap off the page. Foreshortening or odd angles can be hard to get right, though if you do get it right the picture is much more dynamic and appealing

• How did you decide how to position yourself in relation to the objects? Usually I quite like looking up at things, but there wasn't much shadow to be found that way, so I tended to look from above or slightly above to try and fulfil the brief