I would strongly suggest investing in a couple of AD200s, a couple of very compact Manfrotto lightstands, and an Xpro.
What this allows you to do for real estate or interior shots is to set up great sources of diffused lights at bounced angles, with small softboxes, whatever to light the room, and expose for the outside. It will save you hassles with multiple images being merged, then dealing with the HDR visual impacts, like what you see around the window trim, and some of the other artifacts you see here. I picked up all that equipment for my wife who is in real estate, and she has figured it out pretty quickly to my surprise, and liked the results. However she still needs to watch mirrors in the photos, which happen to catch the lighting equipment.
When taking shots at different exposures, with such brightly colored objects, you are going to be creating areas in the photo with strange color casts.
I won't comment about the technical value of the content, as that isn't the question being asked, and would be wildly off topic since the question wasn't "hey how great is this indoor shot for selling property"? It is "why do I get color casts and digital artifacts when taking many shots at different exposures and merging them to reduce the overall DR". I will leave that type of criticism to others.
This shows you where the highest concentrations of cyan, blue, green, magenta, and yellow are in your photo. This is what what you are fighting with outdoor ambient lighting coming in and hitting a bright couch and earth tones in the green spectrum. For me, the only way to combat that IMO is to use strategically placed small strobes like the AD200 to neutralize some of this, but being a small room, that might be tough here. HDR merge of many differently exposed frames are probably going to accentuate these pretty stark areas of color casting, otherwise. You can see the impacts of that couch (which is squarely in the red spectrum) in that room with sunlight or outdoor light hitting and scattering around the carpet and walls.
Also, it seems you have JPG compression set pretty high, ie the JPG level looks like it might be a 5 which isn't good. That is why there are large blocks of identical color instead of something more granular. Either AMASS/POTN did this (which I doubt, because Pekka was painstaking in his details for uploads), or the HDR and editing software caused this when saved to JPG. That isn't doing you an favors with the color casting either.
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