Well, I always tells my builders the best thing to do is put yourself in the scene you're trying to create. In the case of a forest, I'd tell them to go to the nearest park or something and write down what they see. Some have taken my advice and their descriptions have come out quite nice making every room unique and add_items full of detail (LPC codebase). I feel long_desc's should be minimum 4 to 5 lines long and every noun should be accounted for in the add_items of the rooms. Also, adding silly actions like picking blade of grass for no reason add colour to an area and give it a character that players will either appreciate or take for granted, and in both cases, they stay.
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