Nice!

This is board & batten. Boards are installed beside each other and battens are installed over the joints.

@Mark Bischak, Architect, how is what he did not board and batten? He installed boards over the drywall and covered the joints with battens. Albeit, his boards are wider than the ones your diagram depicts, but is it still not the same concept and application? I'm not understanding the point of your comment. Please enlighten me :)

GOOGLE BOARD AND BATTEN WAINSCOTING

At best the OP has drywall & batten.

If someone asks a carpenter for "board & batten", they will get what I show, boards and battens. Words have meaning. No matter what the internet says.

Gotta have the boards to have board and batten. Otherwise you have drywall with strips of trim which I guess you could call a batten wall.

Not the type of trim details I would have added to that particular space and house style, but it seems the OP really likes it and I hope he enjoys it for many years.

Are you looking for a new wall color for all the walls you show in the photos? How do these walls connect to other rooms. Is there a starting and stopping point?

I don't know for sure, but I'd say that the OP DID use boards. That looks to be a very thin applied wallboard (since it's brown). The OP can correct me if I'm wrong but it looks like he/she used a material similar to this: wallboard. If I'm correct then the application meets the official definition I found in NUMEROUS places (Merriam Webster, building websites, etc.) to be rightly called "board and batten."

FWIW, I told my carpenter I wanted a board and batten exterior and got 4x10 smooth Hardie boards applied to the exterior with 1x4 Hardie trim planks covering the joints and spaced every 16" apart. How is that different than what it appears the OP did? Or would you still argue that it's not board and batten, either?

I feel really sorry for the OP. They asked about a wall color and they got a debate on whether they actually have board and batten. To the regular person, nobody gives a flying flip if that's drywall or a thin veneer wood paneling. It looks great.

"Or would you still argue that it's not board and batten, either?"

Flat sheet product with 1x slats applied is NOT Board & Baton. It may be a simulated Board & Baton at best. Not splitting hairs but I hear so many terms used here on Houzz and on TV that are not correct. And it actually gets annoying. No offense intended towards anyone.

@millworkman, do you care to cite a source for that definition?

I'm sorry to be snarky, but it gets equally annoying when things like this are nitpicked. I can't find anywhere where it says that flat sheet products don't qualify as "boards" for board and batten (but really, nothing is flat as it always has some depth no matter how miniscule). I can't find anything, either, that says that the boards have to be less than a particular width to be considered a "board" for board and batten applications. If you can find that information and link it, I will gladly stand corrected.

I think this is just one of those times where definitions have evolved as construction materials have evolved, and it really serves no real purpose, other than to be difficult or prove one's knowledge is superior to another's, to even discuss or point it out. I would argue that "board and batten" is more about the application of a product than the materials used, especially since the materials today are not typically the same materials that were used 200 years ago.

But enough of my rant...have a nice day!

Right from James Hardie but of course they disclaimer the definition as well:

Traditionally, board and batten siding starts with wide vertical planks (boards), which are then joined together by thin vertical strips (battens) to cover the seams. Homesteaders and farmers would use sawmills to cut the long boards, and the battens were put in place to make the structure as airtight as possible. Farmers embraced the style when building barns because the technique was inexpensive, assembly was relatively simple, and the result was energy efficient.

Today, wide panels are used as the primary siding and the batten strips are typically decorative, which gives home designers lots of creative license.

And another article:

Board and batten is a type of wall cladding that features wide boards accompanied by strips of narrow wood that cover the seams. Historically, board and batten came about as a way to create a more energy-efficient structure that also benefits from the additional reinforcement achieved with the battens closing in the spaces between the larger beams. Nowadays, it is almost always chosen as a stylistic decision.

Board and batten can be applied both in the interior and exterior of the home. Interior paneling can be assembled with a board and batten layout, and some interior design trends have started suggesting board and batten as a unique way to create texture within a room. However, most board and batten designs remain on the exterior of the home, integrated into the layout of the siding.

Again, I am not trying to start anything just explaining that that is not nor has ever traditionally been called Board & Baton. It is some ones loose definition of it for their own benefit. I blame most of it on the Joanna Gaines and TV shows taking license over calling things what they want.

More of my board & batten project - paint comes next

Why did you paint the dog brown?

Since the door and trim are painted dark, you need to paint the casing dark too. The white line is too harsh.

Yet more board & batten. I was just looking for paint color recommendations.  I'm sticking with timeless black for the board and batten  - I was just looking for suggestions for wall colors  - currently light gray.

My project finally came to end

Today I changed out the fixture