I liked the robot thing, but it seemed a little slow.
The "artist's inspiration" thing is very good and my favorite of the bunch. The problems I can see are minor, so don't think I'm tearing it up. I'm just trying to point things out

There is a lack of shadows underneath the table and the painting supplies. Things don't quite look like they're sitting on the table or attached to the wall. Maybe there isn't much that can be done, I don't know.
I was going to comment on the strange shading of the jar, but now I realize that it's because the window has those wooden parts making shadows.
The paint tubes look too angled, they either need more polygons or to be smoothed. Also, the shadow on the table leg has the same problem.
Where the floor meets the wall looks too clean and sharp. Usually there's also some kind of molding along the bottom, whether rubber or wood. I don't know how it would be done with that kind of wall though.
I like the "beaming light" from the window, and how the wood across it leaves shadows.
Overall, it's way better than anything I can do in Blender yet.
