Much better!
These windows now have curtains, we can feel their distance from the panes thanks to the shadows cast by the frames, but what about the opposite highlights? They look like light on the curtains or glass and that doesn't make sense. Highlights should be on the wooden frames themselves and colored accordingly.
Also you've entirely removed DerZocker's wall highlight around the round window, that was essential to the recess depth readability.
Pipe shadows are too close to read as shadows, and they should follow the wall volume and detail too: closer to the pipe on protrusions, farther in recesses.
The light is coming from 45° to the left, so the fixings shadows must be 45° staggered too, not on the same line as you made them.
Those pipes have very little highlights. What material are they made of, what is their function? You might suggest glossy stuff like metal by highlights in angles only, although angles being abrupt, these would take up 1 px only. Maybe round the angles? As you're noticing, it can take very little to convey a whole lot of visual information in pixel art.
About color: it's a looooong story! There are likely many threads here that mention it, maybe in
the feature chest (precious reading anyway).
Also check these Pixeljoint forum posts:
here and
there.
