Overall I like the image alot. I agree with skimbles about the height of the ceiling. I also would expect to see some kind of base board around the bottom of the walls. I like your seat textures as well as the table.  I like the lighting in general - not sure if the light on the whiteboard at the back of the room is right. I like the way you lit the cove celing. Nice job.

very nice, but i think your ceiling is a little low? proportions seems a little wrong

good lighting ;)