Like I said, you are getting better. Just a few suggestions.
1)The curve to the bridge is a bit on the sharp side. An easy solution is to put in a dog leg before you hit the curve, that way you have more room.
2) You need to vary your textures a bit. Nothing too big. Just take some similar grass textures and splotch it over the grass sections for a few passes. Same with the rocks in the river. When I do texturing, the ground normally has at least 5 different textures on it. I recommend going from darkest, to lightest.
3) Unless that is a canal, the sides are a bit too steep, and it is too strait. My suggestion. Go to the terrain section and find the plateu tool. Use said tool to gently smooth out the sides and unstraiten the line of the river.
4)While there is the rare yard that uses the style of leapfrogging the classification yards like that, I recommend that you make them the normal style. The reason being is that they are hard to maintain, add undo stress on the engine, the switchman has to cross over tracks to throw the points, and tri-axel locomotives would not be allowed in the yard because they would widen the gauge.
5) I like the station's crossing, but I have one suggestion. Get a sidewalk spline and connect it to the station itself. It will finish off that small detail very nicely.
6) Finally, take your time with it and don't release it until it looks ready. Once you believe that it looks ready, make sure that it acts ready. Throw a train on there in cab mode, with realistic wheelslip, and derailment settings, and run the layout a few times, increasing the speed each time. See where the tight corners are, as well as where the restrictions to speed should be placed.
I hope that this helps Iced.
(Just a little humor folks, not gonna hurt you!).