Could this be the original Sims 1?
I guess first it'd be plausible if the house was wider. I don't know if you're strictly adhering to Sims format, but if you are, in isometric view objects don't get larger the closer they are to you, so the wall on the left would be the same size as the wall on the right (the sky wouldn't be there either). The red cursor is also too far right from the grave. And now I'm being anal but there's a one pixel misalignment on the wall of the building.
It might help if you create a grid before you draw all of the objects on it
