I would ask my teacher but he is not very knowledgeable. Been quite a few times where I had to teach him something. This is why I hope to get into University this year.
Get use to that, in the industry, there are two kinds of people who teach, those who cant do... and those who are tired of job hunting. Further things change so fast that someone who becomes a teacher will normally fall behind in what can be done.
I love the attention to detail in the plates and candle sticks, the books laying around and the odd orb that is on the table. The lighting is very well done, and this is something that can make or break something, or hide other minor issues. You have talent.
Some things that you might want to address, I do not know what program you are using, but the textures on the tables, chairs and book shelf to the right of the window need a little work. Did you make UV maps for them? the grain of the wood in some of them should be going the other way, think about how it was made and how you see the grain of wood on most furniture. It works for the most part, but seems to be that you used cubed for the textures.
This is good if you aren't ever going to move them, but for the chairs, they need UV maps so that the texture doesn't move when the chair moves. (actually the texture says put, the object moves and thus the texture looks to be different, as your teacher for more about texture mapping in this reguard.)
I will admit, texture mapping is a nightmare. More so when you have a high detailed object.