Not bad for a first effort, I see you ran them through CS5, your ISO speeds would have been lower with less noise if you had opened up the aperture a bit more, If you are concerned about loosing depth of field I'd suggest f8 for the moment, they are also lacking in a little sharpness at the smaller apertures, probably your lens is a little out of it's comfort zone.
I take it these are all uncropped, I think you might be noticing what I said about your field of view being limited in the viewfinder with goggles on!
I don't think you have done much post on these, but some gentle adjustment using the curves tool should help improve the levels on some of these and improve the contrast.
Remember the rule of thirds and try and keep the horizon level, e.g. No. 3 where if the horizon was level the gun wouldn't be pointing down.
You didn't ask for critique but I hope this helps.