Well, I'll try and explain what Marcus is saying.
The vanishing points on the walls are off.
Try picking a set perspective and using it. Generally, you want a vanishing point off to the upper right. The other thing you need to do is fix the perspective. Either change the whole thing to complete side-scrolling (change the floor tiles to be only those ones on the side, nothing more) or to rework the walls so the match the angle and perspective of the ground.
So, change them from this:
to this:
The vanishing points on the walls are off.
Try picking a set perspective and using it. Generally, you want a vanishing point off to the upper right. The other thing you need to do is fix the perspective. Either change the whole thing to complete side-scrolling (change the floor tiles to be only those ones on the side, nothing more) or to rework the walls so the match the angle and perspective of the ground.
So, change them from this:
Code:
|-------|
|-------|
L______|
Code:
________
/_______/|
|-------| |
|_______|/