In order to create the most realistic scenery for O model trains, you will need to get familiar with the different methods of cutting and shaping extruded foam. There is an art form to using handsaws, wire brushes, and box cutters in order to create the most realistic scenery. Cutting your Styrofoam will help to lay the groundwork for the scenery, but you need to be familiar with the different methods used in order to paint and cover the scenery in order to make it look like it is alive.
Most people will use paint like burnt umber in order to paint what will look like dirt. This will serve as the base for the landscape in most terrains. If you are looking to have a snowy mountain scene, you may want to use a dark gray paint instead. The paint will have to dry before you can move ahead with any part of the project. Make sure the paint completely covers the Styrofoam. Use two or even three coats of paint if necessary to completely cover the base foam. Many people will use cheap house paint if they are looking to cover large layouts. You will quickly see the quality of the paint does not matter as much as the ability to cover the layout evenly.
Once the paint has had a chance to dry, there are several different ways you can add vegetation to the layout. Because of the size of O model trains, many opt to buy moss sheets from a nursery. These sheets can be either glued into place, or simply laid on. They are preferred because they are real vegetation, which will last a long time without decaying. If you spray the moss with a fine mist of water, it will actually grow a little bit while on your layout.
Lichen is a great way to add shrubs to your scenery. The more popular way to add these to the landscape is to use some diluted schoolhouse glue. Simply mix the glue with water and then dip one end of the lichen. Use the glue in order to stick the lichen into the exact spot you would like for it to be in. The glue will dry clear, so you will not have to worry about it being seen. Another way you can add lichen to a layout is through the use of fine wire. The wire is wrapped around the middle of the lichen and then stuck into the Styrofoam.
Another great way to add realism to your O model trains scenery is to add small tress to it. This is accomplished through the trees you buy from the hobby shop. While there, you should also buy the blue polyurethane that will be poured into the riverbed you have created with the help of your wire brush. Adding some boats to the side of the river is a great way to add more realism to the environment you have created. Have fun in your mini world creating realistic scenery for your O model trains and let your imagination run wild.