Thanks a lot Kosta!
The base was first painted with some browns,after a black primer.
Then after a while I used a mixture with mig acrylic medium,snow(deluxe materials) and a little wood glue and aplied in several layers.This will look like cold,thick snow with ice.I used a drop of brown colour(just a little).Then, I used several mixtures of more snow and less acrylic medium,some microballoons and some ice sparkles here and there.