We have various wiki members who dabble or work with rendering. Although now with two of our fastest renders in the past no longer with the wiki pictures may not be uploaded as quickly. We will still get them up though with time.
My suggestion is if you want to become better with rendering to try some simpler images and then go to more complicated ones to try to improve on the amount of time it takes to render and the cleanliness of around the edges of more complicated images with a lot of curves.
ugh..i didn't think i would ever use this account to comment (nor will this be a regular thing) on here, but i was looking over the feed and i couldn't stand not saying anything:
feel free to email me for rendering help...and if there is ever a time where there is an overly complicated dragon, because some are just way harder to render than others, i wouldn't mind helping out once in a while!