Good to see you're back!
On the screenshots you've shown the lighting is monotonous white and overbright. So it lacks color variation and proper brightness variation. Also, there are strange glitches on the walls.
Some time ago, I wrote a post about how to make a good looking map. Read it, you'll benefit from it
Yeha I taked some parts of Lost City and Surprisingly Focused, if this worng for the creators I wil do other stuff!
There is a saying "steal like an artist", but you're taking it too extreme here. Don't resort to copy-paste: if parts of your map will look like something that players already seen before, these parts won't be fresh, they will lack the feel of novelty and originality.
Instead, do it in a different way. Watch screenshots from any game which has great architecture, find some small architectural feature that you like (wall support, part of the wall, part of the pillar), do some changes to it in your imagination and then remake it in the editor. Then find or imagine some other feature which will look good together with it, and repeat the process. That way you'll create a design which will look beautiful and original.
If you're making a city, you can also use http://images.google.com/
or similar site to find photos of the buildings, and then do the same process I described above, just using these photos instead of screenshots.