The first seems flat to me, again. The second, is much better.
To me it just looks like (in the first) all the tones are similar. Like in Lightroom, if you increased the fill light and recovery. In this one the reds are coming forward and the bridge seems to receed. Everything visually seems to be on the same plane. My first thought for the original post and this 1st one was faeux HDR/tonemapping.
The original posted pic...the truck and building again, seem on the same plane. Whether it is a lack of anything to give perspective, or tonal similarity...
Lights advance, darks receed...Example, the truck is the same color as the sky, putting them on the same plane.
But I see too it's a very cloudy day, which would create very even, flat light.
Hope that helps. It's the best way I can describe it.