The Queen Anne/Free Classic Style is primarily a freeform asymmetrical composition with Classical detailing. Don't confuse a bowed bay with a turret. A symmetrical four-square configuration (not really a "style") with classical detailing was a common form of the Colonial Revival Style in the Northeast even before 1890. Classical detailing and the Colonial Revival Style became more popular after the Columbian Exposition in Chicago in 1893-4 and tapered out after 1915. The term "Four-square" is sometimes used to describe the simple, often plain, square-shaped, 4 rooms per floor, houses built in profusion as middle-class housing between 1900 and 1930. They rarely had the central entrance halls that were common in Colonial Revival houses. If you consider this shape to be a "style" then much of the Italliante and Prairie homes would have to be called four-square. When a term becomes too widely applied it can be a distraction from the more relevant aspects of architectural style. I had never heard the term until I ran across it on the internet even though I studied architectural history in college and grad school. I had a similar experience with "bungalow" and "farmhouse" as house types rather than styles. Here is my house as it was published in 1893 as an example of the new trend in architecture. It still had some Victorian elements especially on the interior but it was a strong departure from Queen Anne and Stick Styles. Later modifications to the interior were pure colonial revival with painted paneling and woodwork.

Well, at this point, the front door is installed as are the other doors in the house, I assume, with the exception of the office door. Whether or not the front door "works" with the other styles is irrelevant at this point. I think both look nice and I guarantee 99.999% of people will never see both doors in the same view and say to themselves, "Oh wow, she should really change that front door out because it totally does not go with those other doors." I think most people would find those things trivial in the grand scheme of things ;) They'll simply say, "My, what a lovely house."

Here are some ideas. I know you didn't ask about this, but my sister had a cat-walk like you do that was open to the living room below. They built a floor and created a gameroom/bonus space. It was the least complicated thing they did to their house because they were also doing kitchens and bathrooms. The only little complication was that they had to raise the windows because they would have been far too low if they left them alone. It was a great improvement because of the bonus space, but it also made the living room below much more cozy and intimate. They were able to get rid of the 2-story hanging ceiling fan and install a beautiful light fixture instead in the living room. People actually use the living room more now than they used to. They didn't put doors on their bonus space but you certainly could. If you eliminate the lowest left-hand window in bedroom, you can install 30" custom closets that are reach in above and drawers below. If you get rid of the fireplace, you have more layout options. I put the long-hanging closet in the space where the bumpout and window are. It's true that windows in closets are not ideal bc the sun will ruin your clothes, but you could put a black-out blind on it. I put 2 options in this drawing, but it's such a large bathroom, you have a several viable options. I drew 2 that keep the toilet and shower plumbing in place. One of the options I drew would require moving the tub plumbing. Your bathroom is so large, you could have a linen/laundry cabinet in there in addition to tub, shower, vanity and toilet room. I love my linen and pull-out laundry. It's styled like a dining room hutch with a piece of countertop material and with the top portion stepped-back like a hutch would be. My cabinet builder made the pull-out laundry side look like drawers, to create symmetry, but they are fake drawers. I'm not a pro, so I'm sure others on here who are real pros will come up with better ideas.

Cute house but I'm not quite clear on what you want exactly for your front door other than a wood colour, your mention modern style so I presume you are changing it to a steel door. Below I show one available at Home Depot in a chocolate brown, I find the style fits with the style of your windows. I'm also showing a railing that would give your porch a finishing touch along with a nice large black lantern style sconce. Maybe you can install a fence along the side of your carport to hide the garbage cans etc. that can be seen now in your picture. A perennial (not much maintenance) flower bed on the right and flowerbox with same type of flowers along the patio (seems to be asphalt there now) would complete the look.