#1.. there just seems to be a lot going on. The bridge, water, trees, fog, and the rocks. But to my eye, the rocks seem to dominate the shot, which is not all that aesthetically pleasing to me. Sorry. Maybe if you moved a few steps over and recomposed the rocks out, the fog, bridge, and water would all work nicely together.
#3.. agree.. that bit-o-bridge is distracting. I like the blurred water. I assume a slower shutter speed, but everything else looks pretty sharp (on my laptop screen). Did you use a tripod? I'm looking at the rocks under the water and can't tell if you used a polarizing filter. Did you? I can't get any EXIF data on your pics. What shutter speed?
#2.. can't say anything. I haven't even started to think about macros or doing these kind of flower shots. Looks nice to me. DOF looks good.