You are going to find that dim lighting on all interior levels is the current fashion. I personally see nothing wrong with a brightly-lit level. It makes the dark levels in the game so much more of a contrast. If all levels are dark or all are brightly lit, that is what gets boring. I do have to admit, though, that a brightly-lit cave is a contradiction. By definition, a cave is not going to be well lit, unless there is a very good reason. If the level is an office, then dim lighting makes no sense, unless the office is closed.
You have to ask yourself, "Why is this cave so brightly lit?" "Does it make sense in my game?"
I like your work. Keep going.
Best regards,
Jim