Your last post looks like a definite improvement over the first.
I would say the floor is still lacking contrast with the background. Floor is almost not noticeable at all.
The columns help break up the monotony of the background but may affect gameplay and look like solid columns, or just look a little off in general as you can't tell if it is gap in the wall or what. I would recommend trying to vary brick color every once in a while. If using a tilemap you could make a standard brick tile then one with a broken brick and one with an offcolor brick.
I would say the background is still a tad dark in general—first impression is almost as you are looking at nothing.
I messed around a little here—lightening and darkening areas just to see what it would look like:
![](http://LouBagel.com/archives/2016/September/pixelationEdit091616.png)
Not saying any of these are keepers but I would play around like that until you find something you like. I do think the varied brick color section looks pretty good though.
![Wink ;)](https://pixelation.org/Smileys/snake/wink.gif)