nice set of images, apart from the last they appear abit dark or underlit rather than under exposed but i think monitor brightnesses could be a reason too
I agree with Caladina, they are a nice set and on both my calibrated monitors they are on the dark side, however, if that is how you wish to present them then that's fine. I often find that when preparing images for the forum I need to brighten them up a touch from what I see in my editing screen.
I tend to lower the exposure in order to bring out the detail. It's just a personal preference. Thanks for the recommendations.