http://davoli.deviantart.com/art/ro-bot-37190756 http://davoli.deviantart.com/art/LIBERTE-747-38048939 http://davoli.deviantart.com/art/VULTUR-62618104 http://davoli.deviantart.com/art/COLLAIDE-...BEAUTY-28619660 http://davoli.deviantart.com/art/AURORA-BOREALIS-29833040
They are all nice and original except the space scene is ugly imo, and I don't like the last one that much either but it's not bad.
They all look really good, but your work seems to lack depth in general. Don't know if you meant to do that with some of them; however, for the space one it looks a bit flat.