The first two look a little over exposed to me.
And the last is very grainy... but a nice capture... Try to find the right balance.
1 and 2 are good attempts but they do look a touch over exposed maybe 1/3 to half a stop. as for the 3rd shot. heavy crop shot through a window?
The composition is good, just the exposure is not quite there. You may find you need to add exposure compensation as you need to tell the camera's light meter what it is seeing
Thanks
Andy
There is a great sharpening guide Here, clickety click!
Last one is noisy,could be that you have oversharpened it...........:shrug:
First two seem a tad overexposed, good captures of the bird though, try lowering the brightness on them,i`m sure they would look a lot better......