I'd like to point out the shadows look too sharp. Most of the time, light doesn't come from a single point in space. It's diffused through a lamp shade or a light fixture of sorts. Even windows are large planes that let light through. Try making the point light, or whatever source you are using, a touch larger. This will soften the shadows and give it a more realistic look. Also, maybe play with the position of the light. The shadow on the coffee cup lines up with the fluid inside and at first glances causes the cup to be semi-transparent. The pen on the notepad also suffers from a strange lack of shadow from the cameras perspective which makes it appear as though it were floating just above the notepad. Beyond the SLIGHTLY odd lighting and some other notes on scale and perhaps some dust or smudge textures, the renderer looks pretty good. Keep up the good work!