C&C per req:
1. Last minute locations can be a challenge, no doubt, BUT you really should have had them bin the pink matteress/cushion. A black and white outfit is just about the worst choice; ask the clients to go inside and choose clothing with a narrower dynamic range. As mentioned, it desparately needs a fill camera right. Why not pose them closer to the pond and use a polarizing fitler; this would have reduced water reflection and increased sky/cloud contrast.
2. Not sure why, but there's something soft about her face. I'm sure there had to be a better background than a concrete wall...
3. As mentioned the reflection in the glasses is a real killer here. A simple position change, polarizing filter or use of a diffuser would almost certainly have eliminated that.
4. Arghhh!! NEVER use on-camera flash for portrait work, indoors or out! The dead-center, tiny catchlights are not attractive. Her skin has a slightly over-bright look from the flash as well. I would definitely have removed the purse, an don't forget to straighten clothing (her skirt).
Just my $00.02 worth - your mileage may vary.
~John