Maybe it looks better in ZC, but the first screen is way too dark. The lava, pots, torches, and railroads are the only thing I can see. I can't tell where the walls are or where the doors are.
The second screen is nice, but the walls that jut out into the center look strange because they exists on 2 different levels of elevation. Seperating them into 2 distinct levels of elevation might make them look a little more normal.
It's actually not that dark in-game. If you zoom in on that image you can sort of get a better feel of how it looks in-game. Also make sure your screen brightness is not set low. Those are bridges not train tracks
As for the other screen, I understand what you mean. I might try something like that, though when I made it I figured someone might see what you see, but didn't think it was a huge deal. I'll see what I can do, thanks for the feedback!