Shadows are a bit harsh, not much you can do about that though. Still, the large dark area at bottom right is a bit distracting. Perhaps a different crop?
4 - Like to have seen the orange stronger for the Challenge, so perhaps tweaking in pp and a tighter crop may have made this better, in my opinion. Also looks a little 'tilted', but could just be the perspective.
Since it's a color study and not a landscape, what if you rotated it so the horizon was on more of a diagonal? i wonder how many people would hate that. . .
while the place looks inspiring, the photo is not...sorry...your location had the potential to get a great shot, and with a little tweaking, you could have had a winner...but this looks like a holiday snap to me with no real depth or thought...sorry to be tough, but you want the truth right?