Haha... now I have nice horror elements in the game... 
Heheh
I agree with you that it's okay to have the tree in the house. I'd explain why it's there in the game, though! =)
However, to me it is very difficult to read the perspective, due to the similarity in hues, pattern and brightness of floors and walls. This extra-sloppy color edit shows what I mean by just lowering a bit the brightness of the floors (thus increasing the contrast with the walls):
It's impressive how much just making the floor a bit darker changes things, though. Much more readable with a quick glance this way!
Your darkmere picture isn't showing up for me, though.
