the green heron photo looks alright, but that the other shot the background on that shot looks properly exposed bu the bird looks a little under exposed but this is just my opinion....
i have been wondering about the color and brightness of my monitor for a while now, last year i sent some of my photos to a lab for printing, they came out a bit darker than i expected and my colors were a bit off from what i saw on my monitor, the printed photos still looked great but they did not really match my monitor that well..
eventually i got a "x-rite Colormunki display" calibration tool, which adjusted my monitor to what the device thinks is the proper color, contrast, brightness and all of that should be, now the printed photos look almost exactly as they do when i view them on my monitor. i think its hard to know if your monitor is set up right unless you get some kind of tool, but i am assuming mine is now set up the way it should be since the photos i got back from a good quality lab now seem to look almost identical to what i see on my monitor.