Good idea, Dune. I eg. already thought about some leaves on the tiles outside. Let me see, what else ideas I have how to mess it up
Unfortunately I'm only some little steps further. I had a horrible TG3 night...
The towel was a bad boy! a part in it had Chinese letters in it's name. TG3 rendered and also saved without any error message. But after a windowsupdate incl. restart, non of the tgd-files could be opened and I got the well known parser-error!
All files (though incrementally saved) since inserting that towel were broken.
But I could remember most settings and changes so I came back to the current level quite fast.
Even the towel could be saved. I didn't find out how to rename the part in TG3 and in Wings3D but in Blender I found that option and now its functionally
Some changes are not too obvious: The basketball and the towel have a slight displacement.
In the windows there are more houseplants and I inserted the "original Terragen giveaway": the Mixed_balcony_flower_box (I preferred a box with a look like wood instead of metal) and I didn't like the dirty leather on the sofa any more - so it has a velvet-like covering now.
Inside:
[attach=1]
Outside:
[attach=2]