Nice job so far!

I like the overall layout and the textures you've used for the wall and objects.

A few suggestions:

1) The floor seems very clean and pristine. Is it intended to be a very clean, well-maintained crypt? If not, I'd suggest darkening the floors and "grunging" them up a bit.
2) Try using a smaller and darker drop shadow for the coffins and other objects, so they look a little more grounded rather than floating up off the floor.
3) A couple light sources would also be a nice detail, unless visitors are supposed to just carry their own lanterns or torches?

And I definitely agree that the overall lighting is too bright. Darker lighting would look much better (IMO) and make more sense, especially if there are no fixed light sources. But if you added some wall torches (or similar) you could create a really nice atmosphere with light and shadow.

Looking forward to seeing more!