Here is the cave mostly finished. Paint needs to be added, snow and some icicles too. I think I may skip the burnt tree depending on how quickly the paint goes on. It will be my first time using snow effects too so I hope it goes alright. I may practice on something else first.
Pics with a grenadier barbarian for scale.
I've got skewers for stability and to hold up the roof. They seem to have worked fairly well.

Low shot

Shot from inside the cave

I'm thinking of keeping the back open for whenever I get the urge to make a cave system out of bark. This will be a great entrance for it. My son keeps on asking me to make a game out of it so it could be fun for some sort of campaign system dungeon crawl. Find the cave, enter the cave, get the treasure, escape the cave blah blah blah.