On the first one, I quite like the main cut. The contrast looks cool, the other pics look cool as well but there the same, images with contrast and they could maybe do with being blended into the bg.
The logos cool but could do with being more visable.
I dont reallylike the team canada one, it's the way all the pics are blended all the same way, sometimes it works on an image and sometimes it doesn't. I think it still looks ok, but I don't like the over all effect of the banner.