I'll give it a go.
1) Lighting is off. Background is not good.
2) What can I say, it's virtually the same shot as the first. However, the lighting is better. Background is still not that flattering, but it works better than the first.
3) Lighting and exposure is good. But it's crooked. Straightening it out would benefit.
4) Yikes, the purple towel. Definitely the towel needs to go. And the pole is a distraction.
5) My favorite of the bunch.
.... The rest are cute and the client will be happy with them, for sure.
My main suggestion for you, is to watch those backgrounds. I know the 28-135 is tough to get any sort of bokeh from, so that should inspire you to watch those BG's even closer.
I will say that you did a good job on focusing your subjects, exposing the shots, and overall capturing those loving moments. Keep it up. And be sure to share with us.
P.S. Don't take my crits as a bash .. only trying to help, I promise.
Much love.