C&C per req:
1, 2: The skin tones are a little warm for my taste, and the very busy background is rather distracting, however the main issue is that she appears to be forcing her smile. I think for this subject, something to distract her just a little so that she isn't looking directly into the lens.
3. Much nicer, but crop the RH side to move her out of the centre.
4. Very nice image, but too much else going on; the very busy background is a major detractor; in this context, the sign doesn't really work, but if it's part of something bigger, it might.
Just my $00.02 worth - your milage may vary.
~John