Good composition, sunlight leads your eyes to the furniture, which have very interesting design.
I like the round window in the back, and I think it plays a big role in the overall image. That is why adding a bit more details in modeling (frames are a bit too thick, edges could be beveled...) would be nice. Also, the glass is there, but it's not that visible. Adding detail to the connection of the glass and the frames, and adding reflections, would fix that. But, now that I think about, maybe the window could be removed completely, and we have only the round opening in the concrete wall.
I assume that the wall is concrete (based on the round holes), since the texture is missing, and that is why I think texturing could also be improved. Also, the wood texture on the furniture is a bit too rough in my opinion. Reducing bump/normal map should improve it a bit.
You could also increase the exposure and reduce the saturation in the background trees. Should help in bringing the focus to the furniture.
I'm curious to see how the rendering would look like, if the window opening was smaller, so that we actually see the round shadows on the ground. Also, making the shadows in the image darker and the highlights brighter, so that we create a bit different mood in the image.
As for the presentation, I think it's a bit too much of borders around the image. Also, since I like images, I would make the text more subtle, and have only one image on one page. That should be your hero image, and later pages can show different stages with multiple images.
I intentionally went back and forth, in a hope to transfer the way of thinking, that will help you improve your rendering skills. Although they are pretty good :).
BTW I think your furniture is a couple of centimeters about the floor, but that happened at least ones, to everyone working in visualization :)
