I like them, first one is definitely a winner. However I'm not a fan of that border, the inside line that's half transparent annoys me. Also, get rid of that watermark, it's way too big.
I'd try that third picture with that plant more to the right/left, just in the middle is kinda boring.
Generally I like them, the first probably being my favourite.
The idea of the barbed-wire shot is interesting. For me, I think the DOF is a touch to shallow, in that it doesn't come from anywhere or lead anywhere if you know what I mean. The fact that it's pretty central probably doesn't help.
I think they are all nice photos. As stated before, they are all somewhat centered, and do get to be a little boring. I like them as black and white phots, but would like to see a little more contrast/definition (if that makes sense) because nothing seems to really stand out in the photos.