I adjusted the glassblock of the bathroom, here it is:
Regarding your question about the painting, I was inspired by this living room found on the web, so if they have succeeded, it means that it could be done
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In real life I would do it, for example, leaving the wall behind the painting so that it could be placed, and therefore not using the glass blocks on that point. I think that it should not be evident that they are not present because of the presence of the painting. In the project that I have posted, I have not used this technique because it is quite complex to do it with Sweethome3D.
In case of the picture of the living room I found in the web, I think that they used some kind of scotch tape to do that
. Bye