the purple doesn't match with the rest of the colors ..
but the shape is pretty well made.
Like apples :) Try a little color change, here's a small example)
If anything, I think the colors should be reversed. I think you should make the purple a tad darker and stick it where the darkest red is. Then take the lightest red and stick it where the purple used to be and then keep the darkest red in the middle of the two colors.
The purple you used for the highlights is darker than the red, which makes it a tad confusing. I also think you could've used less dithering.
Great job, I think the purple needs to be darker and it doesn't really match up with the other colours. It's still going in my favs though.