[WIP] Very first custom story: Dark Ways

[Ongka]

Light:
You should use more ambient light (box lights). Use a little amount (e.g. 0.03) to cover up the completely dark spots. In rooms with more light you should use a higher amount, e.g. the outside area or the room in the first screenshot.
Billboards:
Lower the three color values cause it's too bright in contrast to the environment.
The fourth value is used to determine how lucent the billboard is. Lower this value also.
You should do this with all billboards, in order to make them look more real.
Static objects:
Between every wall, there's a little "gap" which causes the walls not to connect properly.
To fix this, add one welder between every wall. This may take some time, but also improves the look of your map.
Planes:
It looks like you used the standard value of the plane.
This causes the floor to look pretty small sized.
To make it look more real and less repetetive, click on the plane you used, then click on Plane, and lower the Tile amount to something between 0.15 and 0.25 e.g. 0.25 | 1 | 0.25.
If you use "Align To World Coords" you can prevent mismatching of the floor / ceiling pattern.
Entities:
The drawers look to new compared to the other furniture. Add more stuff to the level and it will look better in no time.
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Don't worry, these are small things which aren't that problematic, but
if you try to fix them, your maps will look way better by just paying
attention to them.

Otherwise, nice work!

I hope I was able to help you with this critic.
Feel free to ask questions!