On the pictures in the office.... agree with not changing what you have done (in total). But how about a little adjustment:
Would a 180 be for you to go out and get a pic of just you and the daughter, something real nice? Do a nice frame and just add it to the collection. You don't need anything crazy like a giant mural or anything.
Well, the existing photos aren't framed (they are canvas), so a nice framed one would definitely stand out. However, there is already a picture of just me and my daughter. There's also some of just my daughter, just my step-daughter, just my wife, just me and my step-daughter, just my wife and step-daughter, and some of me and my wife.
But, I guess you're suggesting something new that is just me and my daughter, detached from my wife. It's possible. My wife is going out of town this weekend.