To full view an image, click 'Download'.
One of my biggest issues so far with Weasyl is no full view by default, so this works for now.
I use this Greasemonkey script to display the high-res versions by default: http://userscripts.org/scripts/show/156179
Link
Nalz
I agree, I would much prefer if it would do full view by default. Also, make it a switchable option for those that would complain their internet is slow or they don't need full views on their smartphone.