Ronster said:

I don't want to harp on about the dripping icicle but if you think about sound in the wampa cave. The sound is the main problem.

This is something that I've always found wrong, the no sound in the cave i mean. Snow winds and cave sounds can be made simply by setting up a recording device and running your hand over the carpet, using a tooth brush on a slab of wood, recording a sound (and turning the sound down). Combine these and BOOM!!! You have a snow storm. Though, more sounds may need to be recorded if you want new sounds in the storm.