I really like these renders but the lighting has some room for improvement that may help achieve a more realistic look you're after. It's hard to read what the intended light situation should be. The renders feel like they're intended to be lit mostly by natural light as it's brightest nearest to the window and the shadows cast on the interior are motivated by outside light. However the HDRI seems to be a bit gloomy and almost like overcast which doesn't match the lighting we see. This is most noticeable in the second render where the lighting pouring into the room looks like a gorgeous sunny day yet the HDRI appears to be a bit cold/gloomy. You can lower the strength of all lights except the HDRI, and pump up the strength/exposure to make it blow out a bit and this will help make the HDRI appear warmer.
View attachment 1304217
Both renders also have strong light on the ceiling that I've circled. I'm unsure if this is from an invisible plane light to brighten up the interior more, or if it's actually scene motivated light. If you had added some ghost lights to increase the overall brightness, you may have more interesting results by simply increasing the overall exposure of the render, rather than adding additional lights.
I've done a similar render months ago and found that by adjusting exposure, you can control your overall brightness without interfering with the light dynamics already present in your render by introducing additional lights.
A & B variations are both very similar and I don't have an opinion on which one is more realistic. I do absolutely love the 2nd render in general, it's a chef's kiss experience for me.
