Hey, thanks. Technically, this was not a piece made nor intended to follow and adhere to that or "any" rule of thumb. Matter of fact, my lead instructed me to not use any of those rules of limitation. While I'm the only pixeller who is still onboard and dedicated to seeing this project through; there's realistically not enough time for me to expend large amounts of time on these pieces. But if asked, "then why'd I put them up anyways?", its mainly to raise awareness of this project here as I am just as proud of how this game is coming. I was also encouraged by the rest of my team to post here.
i think there is waay too many different but similar colours here. some colours have only 1 or 2 pixels to them. it is a beautiful image, don't get me wrong, but you could be more conservative with the colour count. just saying. it is one of the challenges of pixel art and when done successfully, the results can be incredible. take a look at some pictures by Fool, such as http://www.pixeljoint.com/pixelart/54911.htm and http://www.pixeljoint.com/pixelart/29178.htm or Snake http://www.pixeljoint.com/pixelart/17123.htm and see how much they can acheive with only a handful of colours and how well unified those pictures are. Good luck and pixel on!
Nice! The roof holes kind of generate a visual glow by the way you did light and color.
Really great!
This is really good! Some really interesting color choices as well.
I agree with CELS about the shadows on the plants though.
Still, it's an impressive work! Good job ;)
Prepare for a spot on the Top Pixel Art list come next month. 
Absolutely stunning and very impressive. Interesting use of lines for the "dithering" as well. My only criticism is that the plants don't cast a strong enough shadow, given that it's a fairly poorly lit room with a few strong light sources. I would have expected stronger shadows, to really make the plants feel part of the environment.
This is one of the most beautiful scenes I've seen in a long time.