FIRST SKETCH UP MODEL AND FURHTER DEVELOPMENT IN CryENGINE

I've done my first sketch up model and uploaded it on the engine. Again when I opened up the engine, the surface texture had disappeared:

Here is my landscape, I've has a lot of difficulty. I asked a few people but they can't seem to figure it out...

Ovbiously I have to work on my landscape and I want to further develop it to reflect the place of inspiration.