I see what you mean with the door, though I dont like smoothing the corners out at all, theres just something about the sharp angles that makes me feel good! I cant explain it. I tried adding a lamp to the table but your right it was a bit too much.
Heres an in-game screenshot showing the kind of angle the door will be seen from, I think it works OK from this angle. Also boosted the saturation (perhaps a little too much) which I think helps overall.
I love those artists you linked, though I find it hard to relate character work onto environment modelling.
@myara I love both those games. I haven't played the 3D Sam and Max version, I'll definitely check it out for some inspiration, thanks!