Interior scene

hello everyone!

I need your help. 1 year ago i heard about blender first time. I’m doing my best to lern Blender+cycles as fast as its possible. Im still not very contented about my work. Especially im talking about lights.

In this sceene a used sun lamp(strength 5) and 3 area lamps (strenght 10) behind the windows. To make it more bright i used ambient onclusion (distance 5 factor 0.91)

What you thing a should do to meke it look more realistic?

I will be very happy for every single advice.