Might I suggest a corridor from the garage to the breakfast nook? After a few dozen times of hauling the groceries from garage to the kitchen by the current route, any residents will be cursing the designer's name -- and their own foolishness in buying/building the thing. But a covered, preferably enclosed walkway/hallway between garage and breakfast nook isn't so bad. You could even just extend the north breakfast-nook wall to the garage; put in big, screened windows in, and a swinging bench, and you have an "outdoor" sitting room or indoor garden (just don't block the path between garage and nook!). That would mesh well with the fountain courtyard immediately south of the garage, actually -- put a door or archway in to be able to have flowing water to one side, a backyard to the front, and the kitchen nearby. Great place for an indoor "picnic"!
Also consider moving the fridge to immediately beside the nook, allowing fast depositing of grocery bags on the floor or the island before putting stuff into the fridge.
I'm a little dubious about having the master bedroom's toilet be so far from a sink to wash one's hands! Stepping around to get to a sink is likely -- especially in the middle of the night -- to make people go "meh" and just wander back to bed. Poor hygiene. I'd suggest putting in an adorable corner-basin in the toilet-room, and let the Vanity sinks be the ones where tooth-brushing (and diaper-changing, if needed) happens. Also consider moving the shower door north, or having it swing open the other way, so one can put a towel-holder in that's luxurious enough to fit that ginormous shower. Though that is a trade-off between being able to get at the water-temperature knobs easily... On the third hand, perhaps think outside the box, and have the temperature-knobs be somewhere besides directly under the nozzle? Trickier piping, but might let you get both.
...I may have lived in too many houses as a kid, and have an unwholesome fascination with floorplans, yes. But, seriously, having to haul groceries through so many twists, turns, doors, and halls, every few days? Whoever's doing that will be buying voodoo dolls of ya.
Master bath comments are noted, critiques okay, easy to shuffle the deck. However, in this size house, regarding the "grocery run", you're missing one important fact: most likely household help will be carrying the groceries, not "Mom."
Nope. Moving slowly. I agree with the stairs. I had originally considered something more spectacular but I was constrained with the entry size due to the proportion of the preliminary perspective study. The stairs would be open to the entry and living area though...