These are great, loving the materials and the lighting. BTW, if the depth of field is composited via a z-pass in a seperate app, I'd be interested to know how.
I found wings references on z-brush central. http://www.zbrushcentral.com/attachment.php?attachmentid=260398 http://www.zbrushcentral.com/attachment.php?attachmentid=260404
This is the finished presentation I showed in class for my character and environment assignment during the Z brush class. Comments and crits very welcome :)