Forest backgrounds are done. I divided them into folders: battle for BE, entrance for entering new areas, general view if we'll need forest pics for some global map or something, stage for general forest pics during exploration, ruins for ruins with chests and powerful mobs you can randomly find during exploration.
Maybe in the future you could go into ruins and the game will generate a small random dungeon, as we discussed it before. If you prefer to leave it until 1.0, for now several options related to research of the ruins should be sufficient, like go inside, explore the surrounding area, throw a stone inside, etc.
I propose 3 areas for now: forest, elven forest, dark/evil/cursed/whatever forest, going by the layers, like in that old huntsman game. MC obliviously could hunt for monster girls in elven part; besides, we could create a separate fame system here: if you want to go to dark part to hunt for top items, you need good relations with inhabitants of elven part, so you can't attack and capture anything that moves even if you have uber party, you should complete some quests for them, etc.
I think about two more locations, something like a maze of canyons leading to the underground maze and ruins of an ancient or simply prewar city.