This the above post says.
Forests can't really be abandonded as they're not really somewhere humans live in. And, even animals are always moving, migrating and travelling so they don't really live there, or be able to abandon it either.
As for the map itself this is where I'm going to get picky, apologies if i seem offensive but:
Try to avoid having 1 tile gaps as areas you NEED to walk through to progress in a dungeon. They're hard to notice and frustrating to find.
Having said that, in a forest avoid big open areas as forests always have tall grass, trees, rivers, mossy rocks, etc. There's no open areas.
What is this pallete? because no offence it is ugly, and horrible to look at. Why is it red? and why does the tall grass just look like corrupted data? I recommend sticking to the usual green pallete, and maybe darkening it for the forest aesthetic.
Give the map a bit more shape. make it clear where the entrance and exit are and make it clear the path to get from point A to point B. Then if you're feeling frisky add some other paths for dead ends, item grabs, or trap trainer battles.