[below is another image from the said 200 using the vivid profile & Plus 9 sharpening & plus 2 Saturation.
anyone has any suggestions or advice I'm very happy to learn & try any advice offered.
I don't think anyone can fix this one. Think about what you have done here. You have taken a picture of a flat wall, with no perspective. And your on camera flash is also hitting that wall from the same angle (flat). You also have some light in the windows at the top of your frame that are defining the maximum exposure of your composition.
Now think about great photos you have seen. Models' faces are never photographed straight on (except maybe mug shots and DL photos). There is always perspective... angles so that light is not all reflected back to the camera on the same plane. There are shadows.
I'd like to comment on the iPhone camera. While it is not a great camera, it is a good one, but with stellar software designed to make mediocre images really 'pop'. Think of it like the TV's you see in stores that are so cranked up and oversaturated, designed to impress. But you get that home and it drills a hole in your head from watching it. When calibrated (to show you as many levels of white to black and as wide a color gamut as possible) it looks muted, and will take some getting used to.
Nikon is one of the more subdued looks out there, with Olympus being at the other end of the scale. The detail is there, but if you want any part of it emphasized, that will be up to you.
The picture of the wall has no real subject, so there is no emphasis. Next time, consider a lower vantage point, and off to one side. If the plaques on the wall are the subject, get a little closer. The looking up and across will give you perspective, depth, and prevent the flash from bouncing straight back into the camera. Also, if there is a lot of light in the frame that is not part of the subject, make sure your metering on the subject (center weighted/spot) and not the whole frame.
The built in camera flash is very tough to work with, and should be considered a last resort. It is not powerful enough to bounce, or be widely diffused, which is why it can't be oriented that way.
Try to keep away from 'flat on'. The camera is two dimensional enough already. When looking at great photos, think about what makes them 'pop'. Perspective. Things are rarely centered, and rarely flat on, and light is interesting and varied (or very purposefully done). It isn't all camera settings; finding the subject's "best side" is a lot of it.
But there are times for snapshots instead of art. And in this case, you want more color saturation, contrast, sharpening and brightness. Pick one of the the profiles (maybe vivid) and crank them up. Note that you'll probably not want that extra pop for portraits as it will be easily noticed as artificial, but it is great for things and landscapes.
Whew... that was a mouthful.
HTH