It looks like a lovely big space, and it seems to have everything a family would need. But then, you did ask for criticism so...
The main room is massive, and as it stands it seems to be divided into four quarters, one of which has no apparent purpose. Have a good think about what you'll use the space for.
The kitchen looks a bit crammed into the corner, and will be a major through route to all the rooms on that side of the house. I'd think about spreading it out a bit toward the back of the house, maybe with a bigger island with some seats?
The downstairs loo is a bit of a long way from the rest of the downstairs. I'd be fine with it, but some might not be keen.
The hallway is BIG, and could be wasted unless you have clear plans for how you'll make use of it. It doesn't even seem to serve a purpose as a circulation area - it's just dead space, unless I'm missing something?
It does look like a lovely big space though, and I'm sure it will be absolutely stunning!