I love that second one. The harsh lines and the sun flare add up to one incredible shot. Not sure what I think about the sepia tones though. What would it look like in B&W?
I think these may look really great in black and white. The sepia tone really just doesn't do it for me, but I think that if you tried b&w the pics would have great contrast, and IMO would be better. Still a nice job though.