First of all, don't do lifestyle photos! I hate them and they put me off because I feel like we wouldn't be a good fit with an estate agent that thinks they're a good idea.
I agree with pps that the angles aren't doing you any favours. The photographer seems to have concentrated on weird things and empty space, both of which throws off the sense of perspective.
We recently had the experience of having our house photographed for an architectural magazine and one thing they did was twitch around the furniture for pretty much every shot - moved a bench and some end tables from one place to another, took some books off the shelves and piled them up, pulled some furniture so it was closer together, had big vases of flowers they moved around, because what looks appealing to the eye, when you're taking in everything in a room, doesn't always come across in a still photo - I suspect that's why some people are perceiving yours as looking unlived in.
I don't actually think styling sells houses, but in your shoes, I might bring out a little kitchen stuff - utensil jar, a bottle of olive oil, a coffee maker, a bowl of fruit, and clear a bit of the stuff out of the dining room. I think it just seems a bit jarring because the rest of the house is so uncluttered. I also think photos that better show the flow of the house would help.
Do you have any area rugs, by any chance? They can really help visually define larger spaces while adding warmth.