Official Artwork
Here is a collection of Ziggy pictures that I've found around the internet, scanned in from artbooks (or with the help of others), or were provided in various fankits. Credit is given where applicable.
Character art and renders
Artbook Images
Some of these were scanned by Ally (ayame.nu), some were found at Xenolegacy (an old Xeno community), others were scanned by me.
Xeno Emissions Scans
Concept art of Ziggy found in the Xeno Emissions books by Chocolate Shop.
Others
E.S. Zebulun and locations that relate directly to Ziggy.