Composition and house looks awesome but lighting is a bit dull/boring. Perhaps try a more direct sunlight render?

I would advice you to check the cards operation temperature, stacking four card this tight does not look like a healthy solution. From what I can see only the bottom card would get air, the others would have their air intake covered by the card below.

Merry X-mas to You too!

The render turned out awesome!

Wine bottle and glass looks amazing! The reflection of the grapes could be driven by a texture map to make it a little more irregular.

Awesome work on the fabric textures! Overall its a very good scene that deserves better lighting, try add more mood perhaps by letting in some evening or morning sunlight?

I hope you not get offended by me posting a changed version of your image, I know you posted in the main gallery and not the wip section. I just want to show an example of what I tried to explain earlier. (unfortunately the curtains is not good in my example, they are very hard to fix in postwork)

The interior holds a very high quality while the outside is heavily overexposed and low in resolution, almost look like watercolor compared to the rest of the image. If you want to imitate a photo overexposured outside is ok, thats the way a photo with correctly exposed interior will look like. If ...

Awesome work! Love the natural lighting in this scene, looks very realistic. The outside environment however spoils the overall impression a bit, try change in postwork.

Congratulations to the Octane render team! Its really, really great to see Octane finally reach v1.0 status!

If memory serves me right you must increase the specular depth in the render kernel settings.