2 3 4 and 6 are rather well composed! If you want to add extra uneasiness or interest in a screenshot, tilt (or roll) the camera to the side so that the lines in the photo (floors/walls etc) are not vertical or horizontal. This is known as a dutch angle (
http://en.wikipedia.org/wiki/Dutch_angle ). You will probably need to add extra scripting and toy around with it a lot to get the angle you need, but I think it would be well worth it! Especially image 2 I think would be quite interesting if it was tilted more (there is already a little tilt, but I would be interested to see what it would look like if it was tilted say another 5 to 15 degrees or so!)
Vertical lines add a strong feeling of power/impressiveness, horizontal lines provide stability, and diagonal lines are interesting.