I don't like the border either, but I like most of the pics.
it would be nice if there was more going on, but for posed shots they are good.
a few things
The arm in the lower right of this pic is distracting. I'd photoshop it out or do a tighter crop if your PS skills aren't up to it. Also, the tip of his foot creates a tangent with the edge of the picture, I'd give it a hair more room if you can.
This one you cut his feet off and the guy walking by in the flannel shirt needs to go. It's sad because I like it otherwise. Maybe you could salvage it by doing a tighter crop.
This one has too much dead space at the top and you cut them off right at the waist. You could probably salvage it with a landscape crop, but I wouldn't bother. It also seems a little grainy.
I'd crop the top of this one a little more.
I'm not sure why you even posted this one. It doesn't fit MM requirements because there are no people in it.
I did notice you tend to cut people off at the joints (knees, ankles, waist) and that's generally considered bad composition.
Hope that helps. Despite the criticism I do like your shots.