Now that you mentioned it, Ulco...
I totally agree, and I see some unnatural lighting and shadows, where those candles in the lanterns are.
I suggest dividing the lanterns in three parts each (in a 3d app): the flame, the glass and the rest. If you put those into the scene at the same position make the glass and the flame (selfilluminating) not cast shadows and position a lightsource exactly where the flame is. This would make the lighting from these sources as natural as possible, I guess.