let us know how shooting the brand new 5D2 is going for you!

Since I've only had the camera for a little while, and I'm not a professional shooter; I've only managed to get a few pictures (portraits) that I really like so far.
Therefore, I attached four of them. Some feedback would be nice

They are nothing spectacular, as you see.
My "models" often manage to smile, but apart from that - what do you do to make photos like these more interesting?
Generally, i try to convey some sort of "mood" or "feel" in the images, but that is way easier said than done...