i can't help but keep thinking this is a rendering of a dollhouse... everything looks small, even though it's technically correctly proportionate to the walls... *shrug*

the reflections are distracting from the effect of the shadows... i'd tone them down a bit (turn down the reflection value in the wood texture).

if this is supposed to be a normal-sized house i could see a directional light working (cause the sun shines through my windows every day and those shadows are pretty consistent) but if this is a smaller piece you're working on i'd go with arran and use a spotlight, or maybe even an elongated area light.