Right on Dave - good lesson you already learned to check your ISO and all your settings when you turn on your camera... Better yet, I have a personal standard configuration, which I try to remember to set my camera to before putting it away - I use Av, Auto ISO through my prefered range, and a fairly wide open aperture, to help ensure that should I need a quick snapshot in low light (usually 'cause my 1 y.o. boy is doing something cute), the camera should be ready to rock. None the less, I still forget to reset my defaults once in a while, with usually bad results ("I was only shooting 6mp jpegs??? Damn!")
I'll critique your photos somewhat too
. Take what I say with a grain of salt though - I'm opinionated, but not really trained ("I may not know about art, but I know what I like"
)...
#1 - really does nothing for me... there's no real subject other than, "there's a river here". When the subject of a photo is the river itself, I think you need to capture some of what makes a river a river... the flow of the water, or the reflection in a calm pool, or a graceful curve of the riverbank. This shot is very static and uninteresting to me - oh well...
#2 - Seems underexposed. Compositionally, again, it doesn't really have any dynamic to it - just a flower dead center with a jumble of vegetation around it (remember (or learn about) the "rule of thirds" and similar compositional elements) . In flower closeup shots, often it's the non-flower elements of the shot which really make or break it, especially the blurred areas, and the look of the blur (bokeh) and the sense of depth that a photo conveys - this is quite flat.
#3 is pretty cool - it has a lot of potential... for instance, I love how the viewpoint is almost level with the water's surface behind the dam, allowing us to see the waters surface, but only barely. The dam is dead center again, and the foreground really doesn't add to the scene for me, so I'd elevate the view a bit, puting the dam along the lower 1/3 line across the scene, and providing those buildings a little breathing room on the top of the frame, which brings me to... The buildings - I want to see more of 'em (though I realize that this might be impossible without walking into the river :P) - if you can step right a couple meters, the buildings will be visible, but framed by the tree which is currently obscuring them... I think that this would make for a more interesting view.
#4 - well, not too exciting, but I have several of the shot saved which look almost identical - dandelions are just too cool to look at up close (zoomed in on the photo) aren't they?
#5 - Cool. Very green. In this case, the very centered framing works because of the symmetrical nature of the trees on either side of the path. This shot has a feeling of depth to it that some of the others lack (in my eyes at least)...