C&C per req:
1. A nice image, but the darkness of the palm trunk seems to distract me. I think brightening this up a little bit would help, especially in the UL where it's so dark that's no visible detail.
2. Nice, well executed, but seems just a hair soft to me. It looks like your autofocus grabbed teh nearest leaf tips rather the centre of the large bloom.
3. I'm afraid I have to say, "Almost but not quite" on this one. Two issues for me: (1) the white blooms are at least one stop too bright, and I think, maybe blown in some spots, and (2) the red splotches in the background are VERY distracting.
As far as technical suggestions go, I would say make sure you check each image for blown highlights and re-shoot as required, and always make sure you know where your camera's focusing, and ensure you have sufficient DoF; that DoF preview button can be a life-saver.
I like your eye; you have a knack for finding some really nice subjects. Keep it up!
Just my $00.02 worth - your milage may vary.
~John
