Ok no one has given you any feed back on the photo so here i go. Since you are a self proclaimed wildlife newbie i'm going to bring up a whole bunch of things so don't think i'm being vindictive or nasty.
Ok first thing is DOF. Your focus point is slap bang in the middle of the duck, which would have been fine except your aperture is too open and the tip of the tail and the beak are out of focus. Next time you either need to focus on the head (Having the eye as the sharpest point if the general rule for wildlife unless trying to highlight a specific feature) or close down your aperture so that the whole duck is in focus. Your shutter speed is about right 1/250th is about as slow as you could go, the duck is moving and you don't want motion blurr so this means you need to increase the iso. You have good natural light so going up to 800 shouldn't be an issue although i like to work at 400 alot of the time.
Framing. Ok so you've got the reflection of said duck, but the crop has scalped the poor bugger. Assuming that the you've cropped it this way change the framing to 3:2 portrait instead of square and give the picture a bit of room for the reflection, this makes the reflection a point of interest instead of a distraction. If you don't have the whole reflection then recrop in landscape tight in on the subject.
Border. I like it actually, don't normally like borders on wildlife but this one isn't too bold that it detracts and because it is translucent it sought of works with the watery feel.
Light levels. ok getting into the nitty gritty stuff now. Shooting on the water can be a pain for you light meter in av or tv mode it will get a random flash of light from a ripple etc and make your settings jump up and down like a gazelle on eckies. This is a good time to go into manual and work out out the exposure on the lcd screen and stick with it. I bring this up cuase you havea bit of blow out on the white feathers, picky stuff but I noticed it so worht mentioning.
Finally post work. I'm not a big photoshopper myself. I tend to think that nature photography should look natural. But that doesn't mean you can't use it to lift the image. An unsharp mask really heps bring out detail for computor moniter viewing (it will also bring some of the out of focus beak back a bit 
), and playing with a few simple things like exposure and saturation can make the shot look that much better.
Anyway i hope you find this constructive, keep at it.
Jeremy
