The array of dots in the background is a limitation of the current software version. Has cheesy 80's sci-fi illustration feel. Click to view original image.

Too many squiggles — was still tuning the default parameters on this one. Click to view original image.

The black outlines around the shadows are nice. Click to view original image.

This one looks amazingly crap-tacular. The footprints in the foreground rendered nicely, however. Click to view original image.