C&C per req:
1. An evocative image, but with room for improvement. When taking pictures of flags, always watch the flags and try and get them at either full extent or when they have that "cartoony" wrinkle in them if possible. I think this image could have been much stronger with a slightly different shooting position to avoid the several "partial" flags, and with the use of a polarizing filter to enhance saturatin and contrast.
2. Very nice; good focus, good exposure, and sort of an interesting dichotomy as well.
3. Another nice shot. This would have benefitted from slightly more DoF so that all the petals were tack-sharp, as well, I think if you've moved a little more, you might have got a more even exposure. Easily corrected in post with some levels/curves work though.
4. Slightly over-exposed perpaps; compared to the previous three, not the most exciting.
Just my $00.02 worth - your mileage may vary.
~John