Think about what will go in the room and the size of door you will need to make that possible. Doors are typically 80" tall. Unless you have high ceilings (10'-12') then you can use taller doors (84" - 96") to keep the room proportional.
A few simple guidelines to get you started:
These are not mandatory rules just basic guidelines I use when designing. There also might be codes that mandate the size of door you install. You will want to check this out as well.
Hope this helps!
Here's an article that may help you.
Proportion guidelines / rules for interiors
need complete floorplan but guidelines have us stumped. HELP
Interior French doors - using cabinet pull not door knob?
Can I install double doors in a standard interior door opening?
I would make the style the same. The article posted above gave some good thoughts on this.
The style would be based on the architectural style of your home. Modern, Traditional, Rustic, Exotic, ... It also depends on how much money you are willing to spend. There are some really impressive doors, but if the budget does not allow it you will be picking something off the shelf from one of the big box stores. They have different styles to pick from but it is much more limited.
Is this a custom house or a standard floor plan from a builder?
Nature's Angle is right about sizes and style. Make all single doors the same style regardless of what room they're in for simplicity and continuity. Bifold doors and French doors will be different. Your 4-panel door is fine, but personally I prefer a 6-panel, two small panels above 4 larger equally sized vertical panels.
Based on the photos you liked on Houzz these will fit in beautifully. Cabinets had a very similar look and it seems you like a clean craftsman style.
I would keep with the same motif for all interior doors. The door you chose is a 4 panel with large lower panels and small upper panels. The panel proportions are about 1/3 upper and 2/3 lower.
I quickly looked for a french door with these same proportions and could not find on Simpson. So you could mix it up a little and go with 3 equal panels for the french doors.
I re-read your last post and sounds like you have already chose your french doors with a grid pattern. This may match the exterior of your house. If this is the case I am leaning towards making the Study doors different than the exterior french doors. Could be something like shown below. Exterior and Interior doors should be the same style but I don't believe they have to be exactly the same.
I am concerned about the whole house fan being in the laundry and the door for this area. Whole house fans pull a lot of air and this door will slam shut. I am not sure that adding lovers to the door will give enough free area to supply the fan. Maybe it is better suited in the hallway behind the range?
These are all tough decisions. Looks like you are doing a good job. I will be writing posts on design decisions like these and posting. Follow me on Houzz or check out my website if you are interested.
Door did not post. See below.
Really like your chosen door. Usually you'd want to use it everywhere, although sometimes people use a simpler/less expensive door on places nobody will see, like closet doors or an en suite bathroom door. (Of course, sometimes people use fancy doors only in those places, so there's that.) I think you're safe in having French doors look different, since they'll already be glass, etc., but it's nice if they can coordinate to some degree, as with Nature's suggestion.
I like it. I am second guessing the interior french door I posted. I wish Simpson had a one more similar to the other interior doors. Although, it does not have to match. I took similar white doors off the internet and put them next to each other. What do you think?
One thing that does concern me is the width of the door's cross rail since they are different door styles. You might ask Simpson if they can revise a Shaker door to have frosted glass where the panels are. Many companies are making custom building products all you have to do is ask.
Just a thought you might consider after having a peek at your plan.
Bedroom #2 door. Could you somehow re-arrange it so that you go into the bedroom from the "closet" side as opposed to "straight" on. Closet doors are always kept closed, bedroom door is often left open. You may have to re-arrange a bit with the closet, but I think it would work better with the entrance to the left and the closet door straight on from dining room.
On our latest home, originally the entrance to bedroom from dining area was with a "jog" and we had to change it to "face on" because of what we did in bedroom.
Bedroom door is always open and I wish it had the entrance to the left side so we didn't see right into the room. Maybe it's 2 late to change plans.