The ladder and the unfinished paint job leads me to believe that you are questioning the color selections and stripy high contrast appearance. There’s an old adage that applies here: “If you emphasize everything, you emphasize nothing”. There’s a lot going on in this room in terms of architectural detail. The detail is beautiful, stands on it’s own, and does not need to be pointed out.

Let’s start with the basics: preparing for paint. The place where the two pieces of drywall come together at the peak of the ceiling needs to either 1) be caulked with paintable painters caulking or 2) be repaired with drywall tape and retextured prior to painting. The shabby area near the can lights needs to be cleaned and retextured prior to painting. The area where old paneling shows near the double door needs to have the paneling caulked over and textured so that it looks like the adjacent drywall, or else replace it with drywall and properly finish the drywall. Any other place where cracks have formed needs to be caulked before painting. Paint alone cannot disguise serious flaws in the underlying drywall.

If this were my room, I would very carefully patch, repair, retexture and then lightly sand the drywall to knock down the excess texture, then I would spray it all with Kilz to get rid of that overwhelmingly intense green. I would pick a shade of white with a taupe undertone (such as Sherwin Williams Accessible Beige). I would then spray everything: walls, ceiling, beams and trim in that one color in flat. I would come behind and cut in on the door and baseboard trim in the same color in a satin semi-gloss since the trim needs to be more durable and washable. Then I would replace every light switch cover, outlet cover and HVAC grill with clean and shiny new covers. I would buy LED conversion kits to install over the old can lights because they will make the room look newer, create more light, and save energy. Then I would install a laminate or wood floor that matches your beautiful stairway. Your objective should be to use this opportunity to repair and paint your drywall to make the house look like new. Without preparing the surfaces before painting, you can’t meet this objective. A calmer monotone will still show the details and will make the rooms seem more bright and spacious. Light colors, especially white are on trend now.

Not green?

It doesn’t really matter if they use “Accessible Beige” or another color of their choosing. The poorly prepared surface is hurting the looks of the room. I find the strong green to be overbearing. Others might not have that same reaction. Here’s a screenshot of the photos with the surface flaws indicated.

The beams are structural element & does not need to be a focal point. Having them a color other than a structural element looks like odd stripes & is very distracting to the room as a whole. If people are walking into the room & staring up, it's not blending into the room.

I suggest painting them back to a structural element. Either paint them satin or gloss white with a different matt white ceiling or paint them a wood color to give the illusion they are wood then paint ceiling white matte or another neutral matte color.

Beams can be covered. For example, dimensional lumber (1” x 6”, 1” x 8”, etc) can be stained to match the stairway and installed over the beams if you would prefer the look of wood.

Prime it all in white. Then paint the beams and ceiling white. Beams should be in semi-gloss. As for the wall color, use the wood staircase finish, the floors and fireplace as guides. Add a dozen more photos of rooms with colors that you really love to your ideabook.

Here are some Eichler remodels with painted beams: https://www.houzz.com/photos/eichler-remodel-phbr0lbl-bl~l_64211  Their color schemes are often professionally selected.

Strip them and stain to match your other woodwork. Add a tongue-and-groove ceiling.

No. It's ribbon candy. You may not be old enough to remember it

<div><a href='https://www.houzz.com/photos/belgian-chic-in-a-1970s-ranch-traditional-living-room-nashville-phvw-vp~1928170' target='_blank'><img

This outs a link to a room I like. It happens to be that the beams are the same color as what I had in mind... Kendall Charcoal

I think a shade of grey in satin or semi gloss. But not too far off from the white of the ceiling so the difference is perceivable but not glaringly so.

It kind of looks like something is missing on the beams, have you thought about installing a cross beam, or ridge beam, even if just for looks. Picture of ridge beam and cross beam every third way up high.

http://thewhitebuffalostylingco.com/vaulted-ceilings-white-or-wood/

Are you thinking of installing a ceiling fan, it might help with temperature regulation, but beware of the strobe light affect with the ceiling lights.

While looking for a example of vaulted ceilings I found examples of painting walls and ceiling the same colors, that might be a good option.

http://paintdora.com/wp-content/uploads/2017/10/paint-the-ceiling-the-same-as-the-wall-color-the-decorologist-painting-ceiling-and-walls-same-color-768x1152.jpg

I found a picture of a ceiling painted in wall color. I wouldn't choose this color but a nice example. Wish the picture showed more though.

[https://www.houzz.com/photos/modern-poolhouse-west-des-moines-contemporary-family-room-phvw-vp~3868017[(https://www.houzz.com/photos/modern-poolhouse-west-des-moines-contemporary-family-room-phvw-vp~3868017)