Well, the screens I enjoyed most were the last one and the one immediately before it. For the train station I would suggest being more random with your foliage as it looks kind of ugly when it's organized. And the service path in screen 1 should be a tile wider.
Yes, layout isn't everything. It counts, but some less amazing layouts have won due to superb theming. Maybe tunnels, bridges, waterfalls or even unnatural theming, but for now all I like is the layout.
I agree with Dotro as well. I like the coasters and you have some great ideas but the foliage looks somewhere in between professional and the stuff you see in pre-made RCT2 scenarios.