Can't say I like the tiles much (they just look unfinished to me) but the objects and characters look superb.
You made great use of dark, desaturated colors to create a moody scene here. I think the character sprites could use slightly more saturated colors to make them more readable and distinct, but don't take that as anything but personal nitpicking. Your efforts paid off with a wonderful pic. Kudos! 
I like it, I wonder if it might look cleaner with less color shades.
the fire should drop light! then it would be enjoyable to look at :3
Great job with this! I really love the combination of tiny and clean. inb4 9000+ favourites.
wonderfully dark & moody.
The darker gray on the knight kind of blends against the background, though.
My only disappointment is in comparing the way the tall sections fade into darkness (aka beautifully - the stone forms darkening down is so nice) to the way the shorter sections fade (kinda bland and bandy).
Real nice overall. You pixel well.
The human sprite is overpixelled and not quite follows the same 3/4 view the other 2 sprites do.
The water, even if underlit, muddy and in a dark dungeon could benefit from just enough higlights to read wet. You even have the highlight colors right there. Just on top and faint should do it ;)
Very stylish and moody, I like it!