The flower pic is really nice, I like it a lot. When I looked at the bigger version it seemed like it might have been a little out of focus...or else it just could have been the flower itself playing tricks on me.
The bridge is another nice picture. Nothing to complain about really...except I don't like the streetlight. Just a location thing I guess, but to me it sorta takes away from the bridge a little.
The last two are sort of...snapshots (wow, I've already learned terminology from this forum!). In the first of the two there appears to be a man on the phone sprouting from the main figure's head. The second is just a weird picture. Why that location? There's so much to look at in the background. With that vibrant wall and that funky looking light fixture, you'd think you could at the very least have had her go down to the landing against the wall and taken a more interesting picture. You'd have to edit out the railing, but I think a shot of her with the light sort of up in the corner would be cool. (Might be a weird angle taking it from the stairs though...)