welcome back!

the stairs do look a lot better like this, good idea to add the lines!
Also the lower level looks great, it might be very dark over all but this really creates a feeling of it being "underground" and is therefore perfect in my opinion. I would probably suggest making the edges of the spots where light falls in less sharp, just give the light a bit more space to fade away.

edit: oh, also I really like the border you added!