Please read about rejection reasons and quality & technical issues below.
Among other things, I see perspective issues on the church building. Jesus Ramirez has a good video on using the Perspective Warp tool in Photoshop CC.
It is dull - it lacks contrast and vibrance. The composition also isn't good - as mentioned there are perspective issues. I think in DPP, it is difficult to correct this. In Photoshop or Lightroom, there is a tool to correct these issues.
Thank you all for the infomation, this is very helpful.