Great pictures. I went back and looked at the "ejecting" shell picture after reading the comments. When I first saw it, I thought the spacial relation looked right (shell to right side of gun). Looking at it again, I still think so but I wonder if using a shell larger than the "propper" shell would make it seem closer to the viewer. I think it looks great as is but it might be something to try.
Keep at it an keep sharing them with us.