There are 2 small things that you could change if you want. The piece looks very good as it is and will be fantastic when you get some textures going.
The railway has 2 issues. I think the bend in them is just a bit sharp. The carts on the right would have a hard time following them i think. In your reference the turn has a radius that look almost twice as big. The railing also has a few more "rails" in it. One small one in the center and some boards or something on either side of the center. Adding them could make it more interesting, but are not necessary.
I suppose the lighting is a bit single colored at the moment but for just a start it is pretty good.
Thanks for the link. It was very useful.
