Do you have the current/old floor plan for comparison?

Also, what sort of climate do you live in? I'm perturbed by the complete lack of foyer in this design. If you have cold winters and use the living room, then anyone sitting in it will get hit with a nasty draft whenever someone opens the door. We just bought a Victorian with its original vestibule (as well as its original layout) and it turns out that the vestibule/proper foyer combo with a closeable door between said foyer and living room is a godsend now that it's winter. But if you're in a mild climate, this is much less of a concern. I still like having a foyer (or at least a foyer zone) as a landing spot for people to hang coats and be greeted, but this can be established with a hall tree and furniture layout if there's not a true foyer.

Ooh interesting! Going from all the closed up window openings you're reopening, looks like you're starting off from a fairly remuddled state. I'm guessing that the dining area is way in the back behind the kitchen? On the opposite side of the house from the living room? Ack!

I think the new plan gives you a better layout overall (especially with the living room, dining room, and kitchen all in succession). The one thing I have a strong disagreement about is taking out the fireplace (if it's original). I like the aesthetic of a foyer/entry fireplace, even if you don't actually use it all that much (I'd put a realistic gas insert in it), and I like the idea of a more secluded library. Seems like it would be a private place, or at least an intimate spot for nightcaps with one or two guests, where you don't necessarily need or want it to be part of the public area flow. Additionally, I'd have a nice two-way swinging door and wall between the dining room and kitchen, but that's a personal opinion because I don't like open kitchens or being able to see kitchen stuff from the front door. Lastly, I'd perhaps reconsider having the master closet in the corner of the house and captive to the bathroom - you generally want windowless rooms like closets to be in the middle of the house (but if that corner doesn't and won't have windows, that makes more sense, I guess) and I've personally never been enthused by the idea of walking through a wet steamy bathroom to find clothes/get dressed.

If it was my home, I'd prefer to have a coat closet closer to the front door. Is there a walkway between the dining room, pantry, and hall bath? If so, is that necessary? Eliminating that little walkway and moving the bath toward the pantry could free up space for a closet there.

Is your laundry open to your master bath? If not make it!