I would love to be able to update previously approved items to include say, new species or update the art. It could cost the same 100 MS to relist, but just go through a similar process to a new item, instead maybe called "Update Item" or something.

For example, I would love to update my druid dream gear to include more species than just lupin but as of right now, I would just have to make a whole new item listing to do so.

Support!, but only to add more breeds, having someone change the design after the fact doesn't sound all that fun

Yeah, that's a good point, I did not think about that! My thought was maybe just small edits like, clean up line art or maybe a little mistake fix. Something the staff would have to look at to make sure the whole item was not being adjusted!

Support for adding breeds!

there is a feature that will be implemented to add new poses

"We will also be adding a way for CA artists to easily add this new wolf breed pose to their existing designs, if they choose to do so."

no support for updating any existing art though - I paid for it as it is, unless there is a mistake that needs fixed, no edits (which you can contact the staff and ask them to update if so)