I get an overall impression that it is beige. It's like a show house but not for now, for about 2000.
The plan shows the dining room being off the kitchen but the pics look like you are using the 'family room' so the dining room on the plan looks like a wasted space or a thoroughfare.
I'd move the table into the dining room and make the family room and lounge look live different rooms, maybe the lounge as a family room - add a couple of toys and then the other room more of an adults only room.
I think you need to rearrange the lilac room, it looks like the only place for a bed is right next to the radiator under the window - that would put me off. Well it would if I could afford to buy.
I agree it looks dark, the outside pics show bright sunshine yet indoors all the lights are on and it still looks dark.
You also have a lot of doors, I know some are closets and I'm not sure what you can do about that.
I know all that sounds negative but I actually really like the house.