Head towards the lit doorway

You decide that light is your best chance of finding a way out of here. You're sure you're too deep down for it to be sunlight or moonlight, but light means an actively maintained section of this undergrown construct, and you're sure the people that use those tunnels have a way back to the surface.

You are surprised to see at the bottom of the staircase, there is a large statue facing in towards the room. It takes up a majority of the doorway, but you are able to break away much of the growth that has grown between the statue and the walls of the staircase. Judging from the rubble around the base, it appears this used to be sealed off. Considering the statue is facing away from the stairs, maybe this used to be an escape tunnel. Hopefully, there isn't something on the other side worth escaping from... You've got nothing to lose at this point. You finish clearing away the brush to make an opening large enough to fit, toss your torch onto a stone slab on the other side, and crawl through.

As you gaze across the large chamber, you decide it must just be for transport. The growth that was so prevalent in the stairway down seems to have not made it this far. You wonder if that is because the environment here just isn't conducive to the growth of the plants, or if this area is being actively maintained... You turn back towards the staircase you came down and realize the the exit you came through is nearly invisible hidden behind the statue and covered in vines. You also aren't surprised to see the front of the statue is, from your guess, a construct of the same figure from the wall carvings.

Seeing a three-dimensional rendering of the woman is something entirely different you're not sure if you were prepared for. You're hoping the statue is larger than scale, because the statue stands at least 15 feet tall. She looks very confidently poised, almost haughty. The figure is depicted wearing an ornate and revealing dress. Her large breasts are each bigger than your head. The look on her face is that of indifferent power and might. She definitely doesn't seem like someone you'd like to cross... With this thought, you turn and proceed across the room.

Although the room is comprised of fine stonework, there are no more complex carvings, just large, plain, stone slabs. You reach the dimly-lit doorway on the other side, and peer in.