Well, it is good for a first attempt, you kinda sorta have an idea of what you want. However, it does not seem cohesive. meaning it does not look like you really know the purpose of every track. It also doesn't look like there is much room for buildings, roads, parking lots, etc.
Unless that is a table in the middle of a room you'll never reach all the areas of the layout. If it is in the center of the room there will till be some places that will be very difficult.
I would suggest reading my Beginner's Guide to Layout Design, clickable from my signature. It'll take you about 10 minutes to read. It puts into perspective the kinds of questions you should be asking yourself.
Now passenger cars are pretty long. They don't do 18" curves very well. For a mostly passenger layout, you have a lot of freight-looking stubs.