Mitsutaka hi and thanks for your comments
Regarding the trees , are made with a balsa cylindrical piece of wood that i make conical with the dremel sander . I make texture then with my modelling razor saw, and use the flame a lighter to take off the hairy threads that come up. I paint in a medium brown. i make tiny holes in sequental crossing positions level by level , and i use Bragdon Enterprises connifer branches and glue them one by one in the tiny holes with CA glue .
Thats it !
Costas