None of the images I upload come out right. Are there tips for making an image be processed better?

[hmatt843]

For instance, if I use this car image:
https://i.imgur.com/03tc2Uv.png

then it comes out like this:
https://i.imgur.com/uBSfUcn.png

which is vaguely car-shaped but nowhere near as impressive as the provided example image.
Is there something I'm doing wrong, like maybe choosing a 'bad' image for Pixel2Mesh? How do I get the best results from custom images?

I'm using the Colab, if that matters.